TY - RPRT TI - Assessment of the Mowry Shale and Niobrara Formation as Continuous Hydrocarbon Systems, Powder River Basin, Montana and Wyoming AU - Lawrence O. Anna AU - Troy A. Cook PY - 2008 DO - 10.3133/ofr20081367 UR - https://pubs.usgs.gov/publication/ofr20081367 ID - ofr20081367 ER -