by Omer B. Raup ... [and others] ; photography by Omer B. Raup ; pen and ink drawings by Arthur L. Isom and Omer B. Raup ; prepared by the U.S. Geological Survey in cooperation with the National Park Service
prepared in cooperation with the U.S. Environmental Protection Agency and Montana Department of Health and Evnironmental Sciences--Water Quality Bureau
Date
1993
Series
Special publication (Montana Bureau of Mines and Geology) ; 106