TY - RPRT TI - Assessment of undiscovered oil resources in the Bakken and Three Forks Formations, Williston Basin Province, Montana, North Dakota, and South Dakota, 2013 AU - Stephanie B. Gaswirth AU - Kristen R. Marra AU - Troy A. Cook AU - Ronald R. Charpentier AU - Donald L. Gautier AU - Debra K. Higley AU - Timothy R. Klett AU - Michael D. Lewan AU - Paul G. Lillis AU - Christopher J. Schenk AU - Marilyn E. Tennyson AU - Katherine J. Whidden PY - 2013 DO - 10.3133/fs20133013 UR - https://pubs.usgs.gov/publication/fs20133013 ID - fs20133013 ER -