"Natural gas." . . "Natural gas United States." . . "Petroleum." . . . . "The future supply of oil and gas a study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975" . . . "The future supply of oil and gas a study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975"@en . . . . "The Future Supply of Oil and Gas. A study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975"@en . . . . "The future supply of oil and gas; a study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975" . . "The future supply of oil and gas, a study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975" . . . . . . . . . . "The future supply of oil and gas. A study in the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975"@en . . . "The future supply of oil and gas: a study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975" . "The future supply of oil and gas : a study of the availability of crude oil,natural gas,and natural gas liquids in the united states in the period throught 1975" . . "The future supply of oil and gas : a study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975" . "The future supply of oil and gas : a study of the availability of crude oil, natural gas, and natural gas liquids in the United States in the period through 1975"@en . . . . . . . "The future supply of oil and gas ; a study of the availability of crude oil, and natural gas liquids in the United States in the period through 1975"@en . . . . . . . . . . . . "Etats-Unis. Pétrole." . . "Petroleum United States." . . "Gas natural EE.UU." . . "William S. Hein & Company." . .