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U.S. Geological Survey
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Penn State
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21. Geographic Names Information System (GNIS) for Alaska and Hawaii 2008
2008. 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...
22. Geographic Names Information System (GNIS) for Pennsylvania
2007. 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...
23. 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...
24. Historic topographic maps for Pennsylvania
2005. U.S. Geological Survey. Historic USGS 15 minute topographic maps for Pennsylvania as collected from the MapTech Historical Map Collection at 'http://historical.maptech.com...
25. 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...
26. National Atmospheric Deposition Program 2004 - Pennsylvania
2004. U.S. Geological Survey. The National Atmospheric Deposition Programational Trends Network (NADPTN) is a nationwide network of precipitation monitoring sites. The network i...
27. National Atmospheric Deposition Program 2005 - Pennsylvania
2005. U.S. Geological Survey. The National Atmospheric Deposition Programational Trends Network (NADPTN) is a nationwide network of precipitation monitoring sites. The network i...
28. National Land Cover Database 2001 - Imperviousness Layer - Southeast
2003. U.S. Geological Survey. The National Land Cover Database 2001 for mapping zone 54 was produced through a cooperative project conducted by the Multi-Resolution Land Charact...
29. National Land Cover Database 2001 - Tree Canopy Layer - Pennsylvania and Northeast
2003. U.S. Geological Survey. The National Land Cover Database 2001 tree canopy layer for mapping zone 60 was produced through a cooperative project conducted by the Multi-Resol...
30. National Land Cover Database 2001 - Tree Canopy Layer - Southeast
2003. U.S. Geological Survey. The National Land Cover Database 2001 tree canopy layer for mapping zone 54 was produced through a cooperative project conducted by the Multi-Resol...