Changes in technology and labor requirements in the crushed-stone industry / by Harry S. Kantor and Geoffrey A. Saeger

Kantor, Harry S. (författare)

Saeger, Geoffrey A. (författare)

United States Bureau of Mines 

Philadelphia, Pa. : Works progress administration, National research project, in cooperation with Department of the interior, Bureau of mines, 1939

Engelska xvii, 169 p.

Serie: National research project on reemployment opportunities and recent changes in industrial techniques. Mineral technology and output per man studies. [Report no. E-8]

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