TY - RPRT TI - Stratigraphic cross section U - U' showing electric logs of Upper Cretaceous and older rocks, Powder River Basin, Powder River County, Montana and Campbell, Converse, and Niobrara Counties, Wyoming AU - James E. Fox PY - 1988 DO - 10.3133/ofr86465u UR - https://pubs.usgs.gov/publication/ofr86465U ID - ofr86465U ER -