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1. 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...

2. 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...

3. New York state boundary with offshore boundaries

2005. U.S. Geological Survey. New York state boundary inculdes offshore boundaries (oceans, bays, and great lakes). This map layer portrays the State boundaries of the United St...