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Books by Gardner, E. D.

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2 books found
Placer mining in the western United States: part III. Dredging and other forms of mechanical handling of gravel, and drift mining
Placer mining in the western United States: part III. Dredg…
By: Gardner, E. D.
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Placer mining in the western United States: part II. Hydraulicking, treatment of placer concentrates, and marketing of gold
Placer mining in the western United States: part II. Hydrau…
By: Gardner, E. D.
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