Mechanization, employment, and output per man in bituminous-coal mining
By: by Willard E. Hotchkiss ... [et al.].
Contributors: Hotchkiss, Willard E.; 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-9
Publisher: Work Projects Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines
Published: 1939
Place of publication: Philadelphia, Pa
Language: eng
Number of pages: 436
Subjects: Coal mines and mining -- United States.; Bituminous coal.; Coal-mining machinery.; Coal miners -- United States.
Notes: Includes bibliographical references.
"August 1939."