Ingersoll, G. E. (1932). Hand 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. Hand Methods of Placer Mining and Placer Mining Districts of Washington and Oregon. [Pullman: State College of Washington, 1932.
Style de citation MLA (8e éd.)Ingersoll, Guy Ernest. Hand Methods of Placer Mining and Placer Mining Districts of Washington and Oregon. State College of Washington, 1932.
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