Technology, Employment, and Output Per Man in Phosphate-rock Mining, 1880-1937 A. Porter Haskell Published: 1938 Total Pages: 156 Get eBook
Technology, Employment, and Output Per Man in Iron Mining Nicholas Yaworski Published: 1940 Total Pages: 294 Get eBook
Technology, Employment, and Output Per Man in Copper Mining Yau Sing Leong Published: 1940 Total Pages: 282 Get eBook
Mechanization, Employment, and Man Output Per Man in Bituminous-coal Mining United States. Work Projects Administration Published: 1939 Total Pages: 492 Get eBook
The Work and Publications of the WPA National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.) Published: 1941 Total Pages: 20 Get eBook
Occupational Information and Guidance Bibliography, 1937-38 Waldo Beale Cookingham Published: 1941 Total Pages: 542 Get eBook
