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1. U.S. Counties (Generalized)

2002. Esri. U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia. Esri.

2. U.S. Rivers and Streams, 2013

2004. U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency. U.S. Rivers and Streams represents detailed rivers and streams in the United States.