 Mines. (Manuscript published by permission of the Director, Bureau of Mines, US Department of the Interior).  Land Policy Review - Página 2por United States. Bureau of Agricultural Economics - 1938Visualização integral - Acerca deste livro
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...predictions were made as to the evil consequences of too rapid exhaustion of our mineral deposits. i Published by permission of the Director, Bureau of Mines, US Department of the Interior. (Not subject to copyrieht.) Presented at the annual convention of the National Association... | |
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