Search U.S. government technical reports digitized or harvested by TRAIL.
Report of Petroleum and Natural-gas Branch :fiscal year 1949
Petroleum and natural gas research program Bureau of Mines, fiscal year 1950
Petroleum and natural-gas research program, Bureau of Mines, fiscal year 1951
Petroleum and natural gas research program, Bureau of Mines, fiscal year 1952
Petroleum and natural gas-research program, Bureau of Mines, fiscal year 1953