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- Hydraulic tunneling in St. Peter sandstone at Minneapolis, Minn.
- Carbide insert bit drilling at the Cleveland-Cliffs Iron Co. mines, Ishpeming, Mich.
- Tunnel construction by peripheral sawing at the Fort Randall Reservoir, Pickstown, S. Dak.
- Ventilation-air heating plants of the Menominee Range
- Bureau of Mines test procedures for rocks,