1. Map of the Wyodak-Anderson coal bed in the Gillette area, Campbell County, Wyoming [cartographic material] Yale Public content 1974. 2013-05-22T18:53:18Z. 2013-06-13T15:35:48Z. Denson, N. M. (Norman MacLaren), 1914-. Dept. of the Interior, U.S. Geological Survey. English. Public. Wyoming and Campbell County.