Technology, employment, and output per man in copper mining
By: by Y.S. Leong ... [et al.].
Contributors: Leong, Yau Sing, 1899-; National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.); United States. Bureau of Mines.
Series: Mineral technology and output per man studies ;; report no. E-12
Publisher: Work Projects Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines
Published: 1940
Place of publication: Philadelphia, Pa
Language: eng
Number of pages: 260
Subjects: Copper mines and mining -- United States.; Miners -- United States.; Mining machinery.
Notes: Includes bibliographical references.
"February 1940."