Ingersoll, G. E. (1933). Small scale methods of placer mining and placer mining districts of Washington and Oregon. State college of Washington.
Style de citation Chicago (17e éd.)Ingersoll, Guy Ernest. Small Scale Methods of Placer Mining and Placer Mining Districts of Washington and Oregon. [Pullman: State college of Washington, 1933.
Style de citation MLA (8e éd.)Ingersoll, Guy Ernest. Small Scale Methods of Placer Mining and Placer Mining Districts of Washington and Oregon. State college of Washington, 1933.
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