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U.S. Geological Survey
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Pennsylvania, United States
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2004
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1. 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...
2. National Land Cover Database 2001 - Tree Canopy Layer - Western Pennsylvania and Ohio
2004. U.S. Geological Survey. The National Land Cover Database 2001 tree canopy layer for mapping zone 47 was produced through a cooperative project conducted by the Multi-Resol...