"In 1917 the miners at the Isle Royale Copper Company's mines were constantly complaining about poor drills and an investigation was made to discover any reasons for the complaint"--page 1.
Mining and Nuclear Engineering
Professional Degree in Mining Engineering
Missouri School of Mines and Metallurgy
ii, 17 pages
© 1921 James Joseph Dowd, All rights reserved.
Thesis - Open Access
Drilling and boring machinery
Isle Royale Copper Company
Rock-drills -- Equipment and supplies
Print OCLC #
Electronic OCLC #
Link to Catalog Recordhttp://merlin.lib.umsystem.edu/record=b2609527~S5
Dowd, James Joseph, "A report on drill steel wear at Isle Royale Mine, Houghton, Michigan" (1921). Professional Degree Theses. 47.