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1. 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 ...

2. National Land Cover Dataset 1992 - Pennsylvania; Albers GeoTIFF

1999. U.S. Geological Survey (USGS). These data can be used in a geographic information system (GIS) for any number of purposes such as assessing wildlife habitat, water quality, pesti...

3. National Land Cover Dataset 1992 - Pennsylvania; Albers Grid

1999. U.S. Geological Survey (USGS). These data can be used in a geographic information system (GIS) for any number of purposes such as assessing wildlife habitat, water quality, pesti...

4. National Land Cover Dataset 1992 - Pennsylvania; Unprojected/Geographic

1999. U.S. Geological Survey (USGS). These data can be used in a geographic information system (GIS) for any number of purposes such as assessing wildlife habitat, water quality, pesti...

5. Nighttime Lights of the World - Human Settlements, 1999

1999. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 1999. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.

6. Purdue Campus: West Lafayette, Indiana, 1999

1999. The Purdue historical campus map collection was scanned and georeferenced by Purdue University Libraries. The physical maps were collected as Purdu...