L. C. Ilsley books & textbook
Operation and Maintenance of Electrical Equipment Approved for Permissibility by the Bureau of Mines (Bureau of Mines Technical Paper 306)
Washington: GPO /1922-01-01 Paperback
Preliminary Investigations of Storage Battery Locomotives, etc. (Bureau of Mines Technical Paper 264)
WASHINGTON: GPO /1920-01-01 Paperback
Permissible Single-Shot Blasting Units
Washington: GPO /1928-01-01 Paperback
Permissible Coal-Handling Equipment Approved from January, 1926, to December, 1930, Inclusive
Washington: GPO /1931-01-01 Paperback
Investigations of Permissible Electric Mine Lamps 1930-40 Bulletin 441
U. S. Government Printing Office /1942-01-01 Hardcover
List of permissible mine equipment approved to January 1, 1942
University of Michigan Library /1942-01-01 Paperback / 40 Pages
Permissible electrically operated post drills and drilling machines
University of Michigan Library /1938-01-01 Paperback / 36 Pages
Inspection and maintenance of mine hoisting ropes
University of Michigan Library /1939-01-01 Paperback / 32 Pages
Permissible blasting units
University of Michigan Library /1941-01-01 Paperback / 28 Pages
Inspection and testing of mine-type electrical equipment for permissibility
University of Michigan Library /1941-01-01 Paperback / 40 Pages
