"United States." . . "Natural resources United States." . . . . . . . "Tomorrow's birthright; a political and economic interpretation of our natural resources"@en . . . . . . . . . . "Tomorrow's birthright a political and economic interpretation of our natural resources"@en . . . "Tomorrow's birthright : a political and economic interpretation of our natural resources" . "Tomorrow's birthright"@en . . "Natural resources." . .