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U.S. Geological Survey
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Penn State
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2006
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1. Chesapeake Bay Watershed Land Cover Data Series 2006
2006. 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. Historic topographic maps for Pennsylvania, Version 2 (Albers)
2006. U.S. Geological Survey. A newly revised version of the historic USGS 15 minute topographic maps for Pennsylvania as collected from the MapTech Historical Map Collection at...