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1901. Harvard Map Collection, Harvard College Library and Geological Survey (U.S.). This layer is a georeferenced raster image of the historic, topographic paper map entitled: Colorado, Denver quadrangle, U.S. Geological Survey. Ed... Harvard Map Collection, Harvard College Library.
1996. Federal Emergency Management Agency. Q3 flood data for Minnesota, 1996. The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Mana... Federal Emergency Management Agency.