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You searched for: Publisher United States Geological Survey Remove constraint Publisher: United States Geological Survey Time Period 1950-1999 Remove constraint Time Period: 1950-1999

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1.

Airdevronsix Icefalls: Antarctica Maps maps university-of-minnesota

1987. Jean-Claude M. Thomas. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

2.

Alexandra Mountains: Antarctica Maps maps university-of-minnesota

1977. Wade; Cathey; Oldham. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

3.

Alexandra Mountains: Antarctica Maps maps university-of-minnesota

1969. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

4.

Argentina Range: Antarctica Maps maps university-of-minnesota

1967. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

5.

Bakutis Coast - Marie Byrd Land: Antarctica Maps maps university-of-minnesota

1968. Projection: Polar Stereographic Projection: Standard Parallel -71º; Series: USGS Sketch Maps. United States Geological Survey.

6.

Beacon Valley: Antarctica Maps maps university-of-minnesota

1992. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

7.

Bear Peninsula: Antarctica Maps maps university-of-minnesota

1978. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

8.

Beethoven Peninsula: Antarctica Maps maps university-of-minnesota

1989. Projection: Lambert Conformal Conic Projection: Standard Parallels -68º40' and -71º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

9.

Blackburn Nunatak: Antarctica Maps maps university-of-minnesota

1968. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

10.

Boyd Glacier: Antarctica Maps maps university-of-minnesota

1977. Wade; Cathey; Oldham. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

11.

Boyd Glacier: Antarctica Maps maps university-of-minnesota

1973. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

12.

Bryan Coast - Ellsworth Land: Antarctica Maps maps university-of-minnesota

1967. Projection: Polar Stereographic Projection: Standard Parallel -71º; Series: USGS Sketch Maps. United States Geological Survey.

13.

Buckley Island: Antarctica Maps maps university-of-minnesota

1989. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

14.

Buckley Island: Antarctica Maps maps university-of-minnesota

1973. Barrett; Elliot. Projection: Polar Stereographic Projection: Standard Parallels -84º14'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

15.

Caloplaca Hills: Antarctica Maps maps university-of-minnesota

1968. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

16.

Cape Adare: Antarctica Maps maps university-of-minnesota

1970. Projection: Lambert Conformal Conic Projection: Standard Parallels -68º40' and -71º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

17.

Cape Chocolate: Antarctica Maps maps university-of-minnesota

1993. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

18.

Cape Hallett: Antarctica Maps maps university-of-minnesota

1970. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

19.

Cathedral Rocks: Antarctica Maps maps university-of-minnesota

1993. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

21.

Dais: Antarctica Maps maps university-of-minnesota

1987. Jean-Claude M. Thomas. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

22.

Daniels Range: Antarctica Maps maps university-of-minnesota

1970. Projection: Lambert Conformal Conic Projection: Standard Parallels -68º40' and -71º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

23.

Davis Valley and part of Cordiner Peaks: Antarctica Maps maps university-of-minnesota

1978. Ford; Schmidt; Boyd Jr. Projection: Polar Stereographic Projection: Standard Parallels -80º14'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

24.

Davis Valley: Antarctica Maps maps university-of-minnesota

1989. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

25.

Dean Island: Antarctica Maps maps university-of-minnesota

1976. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

26.

Deep Freeze Range: Antarctica Maps maps university-of-minnesota

1993. Projection: Lambert Conformal Conic Projection; Series: USGS 1:1,000,000 Topographic Miscellaneous Series. United States Geological Survey.

27.

Denton Glacier: Antarctica Maps maps university-of-minnesota

1987. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

28.

E1-66-12: Antarctica Maps maps university-of-minnesota

1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

29.

E1-66-8: Antarctica Maps maps university-of-minnesota

1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

30.

E2-64-10: Antarctica Maps maps university-of-minnesota

1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

31.

E2-64-11: Antarctica Maps maps university-of-minnesota

1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

32.

E2-64-9: Antarctica Maps maps university-of-minnesota

1960. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

33.

E2-66-10: Antarctica Maps maps university-of-minnesota

1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

34.

E2-66-11: Antarctica Maps maps university-of-minnesota

1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

35.

E2-66-12: Antarctica Maps maps university-of-minnesota

1956. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

36.

E2-66-7: Antarctica Maps maps university-of-minnesota

1961. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

37.

E2-66-8: Antarctica Maps maps university-of-minnesota

1960. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

38.

E2-66-9: Antarctica Maps maps university-of-minnesota

1960. Projection: Polar Stereographic Projection: Standard Parallel 71º; Series: USGS 1:500,000 Topographic Reconnaissance Series. United States Geological Survey.

39.

Ebbe Glacier: Antarctica Maps maps university-of-minnesota

1969. Projection: Lambert Conformal Conic Projection: Standard Parallels -68º40' and -71º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

40.

Ellsworth Land - Palmer Land: Antarctica Maps maps university-of-minnesota

1967. Projection: Polar Stereographic Projection: Standard Parallel -71º; Series: USGS Sketch Maps. United States Geological Survey.

41.

Franklin Island: Antarctica Maps maps university-of-minnesota

1965. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

42.

Freyberg Mountains: Antarctica Maps maps university-of-minnesota

1989. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

43.

Gambacorta Peak: Antarctica Maps maps university-of-minnesota

1968. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

44.

Geologists Range: Antarctica Maps maps university-of-minnesota

1966. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

45.

Granite Knolls: Antarctica Maps maps university-of-minnesota

1993. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

46.

Grant Island: Antarctica Maps maps university-of-minnesota

1974. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

47.

Guest Peninsula: Antarctica Maps maps university-of-minnesota

1977. Wade; Cathey; Oldham. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

48.

Guest Peninsula: Antarctica Maps maps university-of-minnesota

1989. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

49.

Gutenko Nunataks: Antarctica Maps maps university-of-minnesota

1978. Wade; Cathey; Oldham. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

50.

Gutenko Nunataks: Antarctica Maps maps university-of-minnesota

1973. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

51.

Havola Escarpment: Antarctica Maps maps university-of-minnesota

1963. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

52.

Hobbs Coast - Marie Byrd Land: Antarctica Maps maps university-of-minnesota

1968. Projection: Polar Stereographic Projection: Standard Parallel -71º; Series: USGS Sketch Maps. United States Geological Survey.

53.

Holland Range: Antarctica Maps maps university-of-minnesota

1966. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

54.

Hull Glacier: Antarctica Maps maps university-of-minnesota

1975. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

55.

Hut Point Peninsula: Antarctica Maps maps university-of-minnesota

1995. Jean-Claude M. Thomas. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

56.

Joyce Glacier: Antarctica Maps maps university-of-minnesota

1997. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

57.

Knobhead: Antarctica Maps maps university-of-minnesota

1993. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

58.

Knox Coast: Antarctica Maps maps university-of-minnesota

1958. Projection: Polar Stereographic Projection: Standard Parallels 71º; Series: USGS 1:1,000,000 Topographic Miscellaneous Series. United States Geological Survey.

59.

Labyrinth: Antarctica Maps maps university-of-minnesota

1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

60.

Lake Bonney: Antarctica Maps maps university-of-minnesota

1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

61.

Lake Brownworth: Antarctica Maps maps university-of-minnesota

1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

62.

Lake Fryxell: Antarctica Maps maps university-of-minnesota

1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

63.

Lake Vanda: Antarctica Maps maps university-of-minnesota

1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

64.

Leverett Glacier: Antarctica Maps maps university-of-minnesota

1968. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

65.

Liberty Hills: Antarctica Maps maps university-of-minnesota

1967. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

66.

Liv Glacier: Antarctica Maps maps university-of-minnesota

1968. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

67.

Long Hills: Antarctica Maps maps university-of-minnesota

1963. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

68.

Lyon Nunataks: Antarctica Maps maps university-of-minnesota

1989. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

69.

Marble Point: Antarctica Maps maps university-of-minnesota

1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

70.

Marble Point: Antarctica Maps maps university-of-minnesota

1987. Jean-Claude M. Thomas; Jerry L. Mullins. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

71.

Marshall Valley: Antarctica Maps maps university-of-minnesota

1997. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

72.

Martin Peninsula: Antarctica Maps maps university-of-minnesota

1978. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

73.

Matterhorn: Antarctica Maps maps university-of-minnesota

1987. Jean-Claude M. Thomas; Jerry L. Mullins. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

74.

McCuddin Mountains: Antarctica Maps maps university-of-minnesota

1976. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

75.

McMurdo Dry Valleys: Antarctica Maps maps university-of-minnesota

1993. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -70º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

76.

McMurdo Sound: Antarctica Maps maps university-of-minnesota

1975. Projection: Lamber Conformal Conic Projection; Series: USGS 1:1,000,000 Topographic Miscellaneous Series. United States Geological Survey.

77.

Moulton Escarpment: Antarctica Maps maps university-of-minnesota

1963. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

78.

Mount Bastion: Antarctica Maps maps university-of-minnesota

1987. Series: USGS Satellite Image Maps. United States Geological Survey.

79.

Mount Berlin: Antarctica Maps maps university-of-minnesota

1974. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

80.

Mount Bird: Antarctica Maps maps university-of-minnesota

1995. Jean-Claude M. Thomas; Jerry L. Mullins. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

81.

Mount Blackburn: Antarctica Maps maps university-of-minnesota

1985. Stump; Smit; Self. Projection: Polar Stereographic Projection: Standard Parallels -80º14'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

82.

Mount Blackburn: Antarctica Maps maps university-of-minnesota

1989. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

83.

Mount Discovery: Antarctica Maps maps university-of-minnesota

1989. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

84.

Mount Discovery: Antarctica Maps maps university-of-minnesota

1965. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

85.

Mount Discovery: Antarctica Maps maps university-of-minnesota

1996. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

86.

Mount Elizabeth and Mount Kathleen: Antarctica Maps maps university-of-minnesota

1973. Lindsay; Gunner; Barrett. Projection: Polar Stereographic Projection: Standard Parallels -80º14'; Series: USGS 1:250,000 Geologic Reconnaissance Series. United States Geological Survey.

87.

Mount Elizabeth: Antarctica Maps maps university-of-minnesota

1989. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

88.

Mount Erebus: Antarctica Maps maps university-of-minnesota

1995. Jean-Claude M. Thomas. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.

89.

Mount Galla: Antarctica Maps maps university-of-minnesota

1963. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

90.

Mount Goodale: Antarctica Maps maps university-of-minnesota

1989. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

91.

Mount Hampton: Antarctica Maps maps university-of-minnesota

1963. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

92.

Mount Harmsworth: Antarctica Maps maps university-of-minnesota

1989. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

93.

Mount Harmsworth: Antarctica Maps maps university-of-minnesota

1974. Series: USGS Satellite Image Maps. United States Geological Survey.

94.

Mount Huggins: Antarctica Maps maps university-of-minnesota

1997. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

95.

Mount Joyce: Antarctica Maps maps university-of-minnesota

1968. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

96.

Mount Joyce: Antarctica Maps maps university-of-minnesota

1974. Series: USGS Satellite Image Maps. United States Geological Survey.

97.

Mount Kathleen: Antarctica Maps maps university-of-minnesota

1989. Projection: Polar Stereographic Projection: Standard Parallel -80º14'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

98.

Mount Kosciusko: Antarctica Maps maps university-of-minnesota

1976. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.

99.

Mount Lister: Antarctica Maps maps university-of-minnesota

1997. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.

100.

Mount McCoy: Antarctica Maps maps university-of-minnesota

1973. Projection: Lambert Conformal Conic Projection: Standard Parallels -72º40' and -75º20'; Series: USGS 1:250,000 Topographic Reconnaissance Series. United States Geological Survey.