Technology, Employment, and Output Per Man in Copper Mining by Y.S. Leong [et al.]
- Leong, Yau Sing, 1899-.
- Other contributors: National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.); United States. Bureau of Mines. xvi, 260 p. : ill., 1 map ; 26 cm. Mineral technology and output per man studies ; report no. E-12. UK holds archival copy for ASERL Collaborative Federal Depository Program libraries. Call number FW 4.7:E-12.
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- Philadelphia, Pa. : Work Projects Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines
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