Approximate western limit of glaciation within the Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, South Dakota
This coverage contains information about the western limit of glaciation within the 
Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, 
South Dakota. The digital data were produced by the U.S. Geological Survey (USGS) in 
cooperation with the U.S. Environmental Protection Agency. …