TY  - RPRT
TI  - Structure contour map of the base of Mississippian rocks in the Williston basin and adjoining areas of Montana, North Dakota, South Dakota, and Wyoming
AU  - Robert Paul Kunkel
PY  - 1954
DO  - 10.3133/om165
UR  - https://pubs.usgs.gov/publication/om165
ID  - om165
ER  -