TY - RPRT TI - Thickness of lower Cretaceous Mowry shale, Powder River basin, Wyoming and Montana AU - J. E. Fox AU - Debra K. Higley PY - 1987 DO - 10.3133/ofr87340o UR - https://pubs.usgs.gov/publication/ofr87340O ID - ofr87340O ER -