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U.S. Geological Survey
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Base maps
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Penn State
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1. National Land Cover Database 2001 - Land Cover Layer - Pennsylvania and Northeast
2003. U.S. Geological Survey. The National Land Cover Database 2001 land cover layer for mapping zone 60 was produced through a cooperative project conducted by the Multi-Resolu...
2. National Land Cover Database 2001 - Land Cover Layer - Southeast
2003. U.S. Geological Survey. The National Land Cover Database 2001 land cover layer for mapping zone 54 was produced through a cooperative project conducted by the Multi-Resolu...
3. National Land Cover Database 2001 - Land Cover Layer - Western Pennsylvania and Ohio
2003. U.S. Geological Survey. The National Land Cover Database 2001 land cover layer for mapping zone 47 was produced through a cooperative project conducted by the Multi-Resolu...