"Politique énergétique États-Unis 19e siècle." . . "United States." . . "Energieversorgung." . . "Charbon Industrie et commerce." . . "Power resources." . . . . . . . . . . . . . . . "Energy in the American economy, 1850-1975 : an economic study of its history and prospects" . "Energy in the American economy, 1850-1975 : an economic study of its history and prospects"@en . . "Energy in the American economy, 1850-1975 an economic study of its history and prospects" . "Energy in the American economy, 1850-1975 an economic study of its history and prospects"@en . . . . . . . . "Energy in the American economy, 1850 - 1975 : an economic study of its history and prospects" . "Energy in the American economy, 1850-1975; an economic study of its history and prospects"@en . "Energy in the American economy, 1850-1975; an economic study of its history and prospects" . . . . . . . . . . . . . "Energy in the American economy 1850-1975 : an economic study of its history and prospects" . "Energy in the American economy 1850-1975 : an economic study of its history and prospects"@en . . . "History" . . . "History"@en . . . . . . . . . . . . . . . . . . . "USA." . . "Resources for the future." . . "Energiewirtschaft." . . "énergie Etats-Unis 1850 / 1975." . . "Ressources énergétiques États-Unis." . . "Power resources United States." . . "Politique énergétique États-Unis 20e siècle." . . "Geschichte 1850-1975." . .