1. Map showing some potential effects of surface mining of the Wyodak-Anderson coal, Gillette area, Campbell County, Wyoming [cartographic material] Yale Public content 1975. 2013-05-22T18:56:14Z. 2013-06-13T15:35:50Z. Hadley, R. F. (Richard Frederick), 1924-. U.S. Geological Survey. English. Public. Wyoming and Campbell County.