Rock drilling
By: by C.E. Nighman and O.E. Kiessling.
Contributors: Kiessling, O. E. 1901-; 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-ll
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: 158
Subjects: Rock-drills.; Miners -- United States.
Notes: Includes bibliographical references.
"February 1940."