(USDOE ENERGY INFORMATION ADMINISTRATION, WASHINGTON, DC (USA). OFFICE OF OIL AND GAS)United States. Dept. of Energy(United States. Dept. of Energy)1991.
(USDOE ENERGY INFORMATION ADMINISTRATION, WASHINGTON, DC (USA). OFFICE OF OIL AND GAS)United States. Dept. of Energy(United States. Dept. of Energy)1990.
(USDOE ENERGY INFORMATION ADMINISTRATION, WASHINGTON, DC (USA). OFFICE OF OIL AND GAS)United States. Dept. of Energy(United States. Dept. of Energy)1989.