Falls of roof in bituminous coal mines :
influence of the seasons and rate of production /
by J.W. Paul.

APA Citation

Paul, J. W. (James Washington). (1929). Falls of roof in bituminous coal mines: influence of the seasons and rate of production. Washington, D.C.: U.S. Dept. of Commerce, Bureau of Mines .

MLA Citation

Paul, J. W. (James Washington). Falls of Roof In Bituminous Coal Mines: Influence of the Seasons And Rate of Production. Washington, D.C.: U.S. Dept. of Commerce, Bureau of Mines , 1929.

Warning: These citations may not always be complete (especially for serials).