Mineral technology and output per man studies.
Subtitle: [Report no. E-1-E4]
Contributors: United States Bureau of Mines
Published: 1937
Place of publication: [Philadelphia
Language: eng
Subjects: Mineral industries -- United States; United States -- Mines and mineral resources
Notes: Photoprinted.

Issued by the National research project on reemployment opportunities and recent changes in industrial techniques in cooperation with the U.S. Bureau of mines, Report no. E-1-E4.