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Henry Gannett, chief cartographer ; E.M. Douglas, topographer in charge ; triangulation and topography by R.H. Chapman. Relief shown by contours, h... Department of the Interior, U.S. Geological Survey.
1996. Federal Emergency Management Agency. Q3 flood data for South Dakota, 1996. The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency M... Federal Emergency Management Agency.