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Penn State
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1992
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1. Chesapeake Bay Watershed Land Cover Data Series 1992
1992. U.S. Geological Survey. To better understand how the land is changing and to relate those changes to water quality trends, the USGS funded the production of a Chesapeake B...
2. Digital Orthophoto (DOQQ - quarter-quadrangle) for Delaware 1992
1992. 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 ...