The regional aquifer system underlying the northern Great Plains in parts of Montana, North Dakota, South Dakota, and Wyoming--summary - Downey, Joe S.; Dinwiddie, George A., 1933- (Washington : United States Government Printing Office, 1988)
Three folded leaves of illustrations in pocket
Bibliography: p. 34-64
Keywords: Aquifers -- Great Plains; Aquifers -- Montana; Aquifers -- North Dakota; Aquifers -- South Dakota; Aquifers -- Wyoming