Rock drilling /

Bibliographic Details
Main Authors:	Nighman, C. E. (Author), Kiessling, O. E. (Oscar Edward), 1901-1993 (Author)
Format:	Government Document eBook
Language:	English
Published:	Philadelphia, Pennsylvania : Work Projects Administration, National Research Project : Department of the Interior, Bureau of Mines, 1940.
Series:	Mineral technology and output per man studies ; rept. no. E-11.
Subjects:	Rock-drills > United States. Miners > Effect of technological innovations on > United States. Labor productivity > United States. Miners. Rock-drills. United States.
Online Access:	https://purl.fdlp.gov/GPO/gpo111120