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Mechanization, employment, and output per man in bituminous-coal mining ; 1
Hotchkiss, Willard E. (contributor) - 1939
Persistent link: https://www.econbiz.de/10003201812
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Mechanization, employment, and output per man in bituminous-coal mining ; 2
Hotchkiss, Willard E. (contributor) - 1939
Persistent link: https://www.econbiz.de/10003201816
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Technology, employment, and output per man in iron mining
Yaworski, Nicholas; Kiessling, O. E.; Baxter, C. H. - 1940
Persistent link: https://www.econbiz.de/10002811893
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Mechanization, employment, and output per man in bituminous-coal mining
Hotchkiss, Willard E. (contributor) - 1939
Persistent link: https://www.econbiz.de/10003085757
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Minerals yearbook
United States / Bureau of Mines; United States … - Washington, DC : US Gov.Print.Off. - 1932 -
Persistent link: https://www.econbiz.de/10004071373