1. Geologic map and distribution of heavy minerals in Tertiary rocks of the Gillette 30ʹ x 60ʹ quadrangle, Campbell, Crook, and Weston counties, Wyoming Yale Public content 1989. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Wyoming, Campbell County, Crook County, and Weston County.