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Environment
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Biota
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Penn State
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2004
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1. Aquatic Community Classification Project: Pennsylvania
2004. Aquatic Community Classification Project, prepared by the Western Pennsylvania Conservancy.
2. Ecoregions United States (Bailey)
2004. USDA Forest Service. This map layer is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.S. Virgi...