Time-study Analyses
Time-study Analyses
Iron Deposits of Buckhorn Mountain, Meyers Creek Mining District, Okanogan County, Wash
Report of Investigations 4058-4076
Churn-drill Performance
Mining and Grinding Methods and Costs at the Dennison Sewer Pipe Company Clay Mine, Dennison, Ohio
Time Study Analyses
Report of Investigations 3487-3509
Methods and Costs of Mining and Crushing Gypsum at the Mine of the Victor Plaster, Inc., Victor, N.Y.
Information Circular 6892-6919
Information Circular 6960-6976
Churn-drill Performance
Information Circular 6861-6891
Report of Investigations 3457-3474
Gold Mining and Milling in the Black Mountains, Western Mohave County, Ariz
Lime
Information Circular 6920-6942, [6726]
Mining and Grinding Methods and Costs at the Malvern Clay Co. Mine, Malvern, Ohio
Engineering Experiment Station Circular