Control of the silicosis hazard in the hard rock industries
Subtitle: II. An investigation of the Kelley dust trap for use with pneumatic rock drills of the "jackhammer" type
By: By Theodore Hatch, George S. Kelley, J. William Fernel
Published: 1932
Place of publication: n.p
Language: eng
Number of pages: 11
Notes: Cover serves as title-page.

"Reprinted from the Journal of industrial hygiene, vol. XIV, no. 2, February, 1932," pp. 69-79.

"Publications from the Harvard Engineering School, 1931-32, no. 79."