More profit in mechanical mining through studies of loading and gathering performance
By: by A. Wayne Bitner and David R. Mitchell.
Contributors: Mitchell, David Ray, 1898- joint author.
Series: Pennsylvania. State College. Mineral Industries Experiment Station. Bulletin,; no. 50
Publisher: School of Mineral Industries
Published: 1949
Place of publication: [The Pennsylvania State College]
Language: eng
Number of pages: 37
Subjects: Mining engineering.; Time study.
Notes: Forms A-D laid in.
"Selected list of publications": p. 37.