I-2021 Geologic map and distribution of heavy minerals in Tertiary and uppermost Cretaceous rocks of the Recluse 30' x 60' Quadrangle, Campbell and Crook counties, Wyoming, scale 1:100,000, 1990, ISBN 978-0-607-79181-5 Keywords: Campbell county, Crook county, Geologic map, Bedrock, Powder river basin