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Permissible mine equipment approved during the calendar years 1953-54
R. A. Kearns · U.S.Dept. of the Interior, Bureau of Mines
12 sayfa · 1955
Safety measures / Coal mines and mining / Mine safety / Equipment and supplies
Permissible mine equipment approved by the Bureau of Mines during 1959-60
R. A. Kearns · U.S.Dept. of the Interior, Bureau of Mines
20 sayfa · 1961
Mining machinery / Mine safety