TY - RPRT TI - Assessment of undiscovered continuous oil and gas resources in the Heath Formation, central Montana and western North Dakota, 2016 AU - Ronald M. Drake AU - Christopher J. Schenk AU - Timothy R. Klett AU - Phuong A. Le AU - Heidi M. Leathers AU - Michael E. Brownfield AU - Thomas M. Finn AU - Stephanie B. Gaswirth AU - Kristen R. Marra AU - Marilyn E. Tennyson PY - 2017 DO - 10.3133/fs20173032 UR - https://pubs.usgs.gov/publication/fs20173032 ID - fs20173032 ER -