TY - RPRT TI - Geologic framework of the ground-water system in Jurassic and Cretaceous rocks in the Northern Great Plains, in parts of Montana, North Dakota, South Dakota, and Wyoming AU - Lawrence O. Anna PY - 1986 DO - 10.3133/pp1402b UR - https://pubs.usgs.gov/publication/pp1402B ID - pp1402B ER -