What the coal miners can do to prevent injury from falls of roof /
by J.W. Paul.

APA Citation

Paul, J. W. (James Washington). (1930). What the coal miners can do to prevent injury from falls of roof. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Paul, J. W. (James Washington). What the Coal Miners Can Do to Prevent Injury From Falls of Roof. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, 1930.