- Bear Lodge Mining District
| Epstein J. B., Doctor D. H. (2013), Evaporate Karst in the Black Hills, South Dakota and Wyoming, and the oil play in the Williston Basin, North Dakota and Montana, USGS, 39 pp. (Prepared for the Karst Interest Group Workshop, September 2005) Epstein J. B. (2001), Hydrology, Hazards, and Geomorphic Development of Gypsum Karst in the Northern Black Hills, South Dakota and Wyoming, In Eve L. Kuniansky, editor, 2001, U.S. Geological Survey Karst Interest Group Proceedings, Water-Resources Investigations Report 01-4011, p. 30-37. |