TY - RPRT TI - Preliminary report of 1977 coal drilling in eastern Montana and northeastern Wyoming: Geophysical logs for Dawson, McCone, Richland, and Rosebud Counties, Montana AU - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey AU - Montana Bureau of Mines and Geology PY - 1978 DO - 10.3133/ofr77721f UR - https://pubs.usgs.gov/publication/ofr77721F ID - ofr77721F ER -