A testing procedure for the certification of underground protective cabs and canopies /
Sawyer, Stephen G.
A testing procedure for the certification of underground protective cabs and canopies / by Stephen G. Sawyer and Darryl K. Brogan. - [Washington] U.S. Dept. of the Interior, Mining Enforcement and Safety Administration, 1974. - ill. 15 p. : - Informational report - MESA, 1002 0097-9376 ; . - Informational report (United States. Mining Enforcement and Safety Administration), 1002. .
90053097
Mine safety.
A testing procedure for the certification of underground protective cabs and canopies / by Stephen G. Sawyer and Darryl K. Brogan. - [Washington] U.S. Dept. of the Interior, Mining Enforcement and Safety Administration, 1974. - ill. 15 p. : - Informational report - MESA, 1002 0097-9376 ; . - Informational report (United States. Mining Enforcement and Safety Administration), 1002. .
90053097
Mine safety.