A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Placer mining in western United States
Part III. Dredging and other forms of mechanical handling of gravel, and drift mining.
Placer mining in western United States
Part III. Dredging and other forms of mechanical handling of gravel, and drift mining.
Placer mining in western United States
U S Bur Mines -- Information Cir
Gardner, E.D. (author) / Johnson, C.H. (author)
1935
81 pages
Supp plates
Report
English
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| Engineering Index Backfile | 1947
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Timbering in deep placer mining
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