Falls of roof and coal in mines operating in the Pittsburgh coal bed in Marion and Monongalia counties, W. Va. /
by J.W. Paul and J.N. Geyer.

APA Citation

Paul, J. W. (James Washington)., Geyer, J. Nicholas., United States. Bureau of Mines. (1932). Falls of roof and coal in mines operating in the Pittsburgh coal bed in Marion and Monongalia counties, W. Va.. Washington, D.C.: U.S.Bureau of Mines.

MLA Citation

Paul, J. W. (James Washington), John Nicholas Geyer, and United States. Bureau of Mines. Falls of Roof And Coal In Mines Operating In the Pittsburgh Coal Bed In Marion And Monongalia Counties, W. Va.. Washington, D.C.: U.S.Bureau of Mines, 1932.