TY - RPRT TI - Utilization of gamma-ray logs by the U.S. Geological Survey, 1949-1953 AU - Kenneth Granville Bell AU - V.C. Rhoden AU - R.L. McDonald AU - C. M. Bunker PY - 1961 DO - 10.3133/ofr6121 UR - https://pubs.usgs.gov/publication/ofr6121 ID - ofr6121 ER -