Designing a rock bolting system
By: by D. S. Choi and R. Stefanko.
Contributors: Stefanko, Robert, 1926- joint author.; Pennsylvania. State University. Dept. of Mining.
Publisher: Pennsylvania State University]
Published: 1969
Place of publication: [University Park
Language: eng
Number of pages: 94
Subjects: Mine roof bolting.
Notes: Bibliography: leaves 83-85.
At head of title: Special report of research conducted in [the] Department of Mining, College of Earth and Mineral Sciences, the Pennsylvania State University.
"Investigation conduced under the auspices of the Coal Research Board of the Commonwealth of Pennsylvania, contract number CR-77."