OC-75 Stratigraphic diagrams with electric logs of Upper Cretaceous rocks, Powder River basin, Natrona, Converse, and Niobrara counties, Wyoming, section C-C', 1977, ISBN 978-0-607-82378-3 Keywords: Powder River Basin, Geologic maps, Bedrock, Stratigraphic Geology, Stratigraphy, Natrona county, Converse county, Niobrara county