Big Ten Academic Alliance Geospatial Discovery Portal

Big Ten Academic Alliance Geoportal

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You searched for: Time Period 1950-1999 Remove constraint Time Period: 1950-1999
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1.
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Ambient and fixed station network groundwater monitoring point data (1985 - 1998): Pennsylvania

1999. PA Department of Environmental Protection. This coverage represents the point locations and data for 1,106 groundwater quality monitoring points sampled under the PA DEP Fixed Station Networ...

2.
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Annual Average Daily Traffic (AADT) Turning Traffic 1999: Iowa

1999. Iowa DOT GIS Services. Iowa turning traffic data (AADT) for intersections on the primary, secondary and municipal roadway systems for 1999. The state is divided into 4 qu...

3.
Archived Submerged Aquatic Vegetation - SAV 1999: Maryland

Archived Submerged Aquatic Vegetation - SAV 1999: Maryland

1999. Maryland iMap. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov. The Chesapeake Bay SAV was mapped from 1:24,000 black and whit...

4.
Bedrock geologic map and mineral exploration data of the western Vermilion district, St Louis and Lake Counties, northeastern Minnesota, M-98

Bedrock geologic map and mineral exploration data of the western Vermilion district, St Louis and Lake Counties, northeastern Minnesota, M-98

1999. Peterson, Dean M. and Jirsa, Mark A. Compilation of interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments), mineral exploration dat...

5.
Bedrock geologic map of northwestern Minnesota, M-92

Bedrock geologic map of northwestern Minnesota, M-92

1999. Jirsa, Mark A., Chandler, Val W., and Runkel, Anthony C. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of northwestern Minnesota, scale 1:200,...

6.
Bedrock geologic map of the Aitkin 30 x 60 minute quadrangle, east-central Minnesota, M-99, Plate 1

Bedrock geologic map of the Aitkin 30 x 60 minute quadrangle, east-central Minnesota, M-99, Plate 1

1999. Boerboom, Terrency J., Severson, Mark J., and Southwick, David L. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) Aitkin quadrangle, scale 1:100,000.

7.
Bedrock geologic map of the Aitkin 30 x 60 minute quadrangle, east-central Minnesota, M-99, Plate 2

Bedrock geologic map of the Aitkin 30 x 60 minute quadrangle, east-central Minnesota, M-99, Plate 2

1999. Boerboom, Terrency J., Severson, Mark J., and Southwick, David L. Data base, Aitkin quadrangle showing drill holes, outcrops and other data used to make interpretations of bedrock geology for map M-99, scale 1:100...

8.
Bedrock geologic map of the Allen quadrangle, Minnesota, M-91

Bedrock geologic map of the Allen quadrangle, Minnesota, M-91

1999. Severson, Mark J. and Miller, James D., Jr. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Allen quadrangle, scale 1:24,000.

9.
Bedrock geologic map of the central Duluth Complex and the western part of the Beaver Bay Complex Lake and St Louis Counties, Minnesota, M-101

Bedrock geologic map of the central Duluth Complex and the western part of the Beaver Bay Complex Lake and St Louis Counties, Minnesota, M-101

1999. Miller, James D., Jr. and Chandler, Val W. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of part of the Duluth Complex, scale 1:...

10.
Bedrock geologic map the Mille Lacs 30 x 60 minute quadrangle, east-central Minnesota, M-100, Plate 1

Bedrock geologic map the Mille Lacs 30 x 60 minute quadrangle, east-central Minnesota, M-100, Plate 1

1999. Boerboom, Terrency J., Severson, Mark J., and Southwick, David L. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) Mille Lacs quadrangle, scale 1:100,000.

11.
Bedrock geologic map the Mille Lacs 30 x 60 minute quadrangle, east-central Minnesota, M-100, Plate 2

Bedrock geologic map the Mille Lacs 30 x 60 minute quadrangle, east-central Minnesota, M-100, Plate 2

1999. Boerboom, Terrency J., Severson, Mark J., and Southwick, David L. Data base, Mille Lacs quadrangle showing drill holes, outcrops and other data used to make interpretations of bedrock geology for map M-100, scale ...

12.
Raster

Digital Orthophoto Quarter Quadrangle images for Pennsylvania

1999. U.S. Geologic Survey; Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...

13.
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Gap Stewardship: Pennsylvania

1999. Joseph A. Bishop. Coverage showing stewardship of managed conservation lands throughout the Commonwealth. Includes federal, state, county and privately owned lands i...

14.
Geology of the Root River State Trail area, southeastern Minnesota, Educational Series-10, Plate 1

Geology of the Root River State Trail area, southeastern Minnesota, Educational Series-10, Plate 1

1999. Mossler, John H. Front, Sites of geologic interest along the Root River State Trail, southeastern Minnesota, West half, scale 1 inch = 1/2 mile.

15.
Geology of the Root River State Trail area, southeastern Minnesota, Educational Series-10, Plate 2

Geology of the Root River State Trail area, southeastern Minnesota, Educational Series-10, Plate 2

1999. Mossler, John H. Back, Sites of geologic interest along the Root River State Trail, southeastern Minnesota, Eest half, scale 1 inch = 1/2 mile.

16.
Index of USGS 100,000 Scale Quadrangles: Indiana

Index of USGS 100,000 Scale Quadrangles: Indiana

1999. United States Geological Survey. This dataset shows the grid index of USGS 100K quadrangles. Each polygon is attributed with the official USGS quadrangle name and index number.

17.
Index of USGS 250,000 Scale Quadrangles: Indiana

Index of USGS 250,000 Scale Quadrangles: Indiana

1999. United States Geological Survey. This dataset shows the grid index of USGS 250K quadrangles. Each polygon is attributed with the official USGS quadrangle name and index number.

18.
Mixed

National Elevation Dataset 10 Meter 7.5x7.5 minute quadrangle for Pennsylvania

1999. The U.S. Geological Survey has developed a National Elevation Database (NED).The NED is a seamless mosaic of best-available elevation data. The 7.5...

19.
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National Elevation Dataset 30m County Mosaics for Pennsylvania

1999. U.S. Geological Survey (USGS), EROS Data Center. The U.S. Geological Survey has developed a National Elevation Dataset (NED). The NED is a seamless mosaic of best-available elevation data. The 7.5...

20.
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National Hydrography Dataset (NHD) Flowline: Pennsylvania (medium resolution)

1999. U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the sream segments or reaches that co...