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You searched for: Time Period 1950-1999 Remove constraint Time Period: 1950-1999
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1.
Vector

104 State Water Plan Watersheds: Pennsylvania penn-state

1998. Environmental Resources Research Institute. Digitized boundaries of 104 major watersheds defined in the Pennsylvania state water plan. The State Water Plan, originally developed in the 1970s,...

12.
Point

Abandoned Quarries: Indiana (Web Map Service) purdue

1998. IndianaMap ArcGIS Online. Abandoned Quarries, 1998 - Shows abandoned quarry locations that have locational information that is adequate to determine coordinate alues. Derive...

13.

Abandoned railroads of Indiana. indiana

1960?. Pen and ink.; Base map: Geological Survey (U.S.). State of Indiana, Scale 1:500,000, Washington, D.C., 1950. Scale approximately 1:2,027,520.

14.
Point

Abandoned Sand and Pits: Indiana (Web Map Service) purdue

1992. IndianaMap ArcGIS Online. Abandoned Sand and Gravel Pits, 1992 - Shows the locations of abandoned sand and gravel pits, including 2,275 of 2,515 sand and gravel pit location...

15.

Academy Gletscher: Greenland minnesota

1953. Projection: Polar Stereographic Projection; Series: AMS C501 Greenland 1:250,000 Topographic Series.

16.
Vector

Active Railroads: Pennsylvania penn-state

1996. Environmental Resources Research Institute. Location of active rail lines in Pennsylvania, digitized from 1:24,000 USGS topographic maps on a stable Mylar base.