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U.S. Geological Survey
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Pennsylvania Spatial Data Access (PASDA)
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51. 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...
52. Chesapeake Bay Watershed Land Cover Data Series 1984
1984. 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...
53. Geographic Names Information System (GNIS) for Pennsylvania
1981. U.S. Geological Survey. The Geographic Names Information System (GNIS), developed by the U.S. Geological Survey in cooperation with the U.S. Board on Geographic Names (BGN...