A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district / by J.W. Paul and L.N. Plein.
|Main Author:||Paul, James Washington.|
|Other Authors:||Plein, Leopold Nicholas, 1897-|
Washington, U.S. Bureau of Mines, 1932.
Coal mines and mining
iv, 98 p. :
illus., map, tables, forms ;
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