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You searched for: Author U.S. Geological Survey Remove constraint Author: U.S. Geological Survey Subject Imagery and Base Maps Remove constraint Subject: Imagery and Base Maps Place Pennsylvania, United States Remove constraint Place: Pennsylvania, United States Year 2004 Remove constraint Year: 2004
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1. 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...