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Supervision as a Means of Preventing Accidents from Falls of Roof and Coal

W. H. Forbes

Published: 1931

Total Pages: 10

Technical Paper

United States. Bureau of Mines

Published: 1936

Total Pages: 1134

Technical Paper

Published: 1935

Total Pages: 1156

Information Circular

Published: 1929

Total Pages: 892

Miners' Circular

Published: 1942

Total Pages: 1184

Miners' Circular

United States. Bureau of Mines

Published: 1945

Total Pages: 1644

Report of Investigations

Published: 1931

Total Pages: 852

Report of Investigations. [no.2002 to No.7380]

Published: 1933

Total Pages: 796

Laboratory Batch Still and Fractioning Column for the Production and Study of Lubricating Distillates Under Vacuum

Boyd Guthrie

Published: 1932

Total Pages: 1364

Hearings

United States. Congress Senate

Published: 1949

Total Pages: 2588