Hints on coal-mine ventilation / by J.J. Rutledge.
|Main Author:||Rutledge, J. J. b. 1870.|
Washington, Govt. Print. Off., 1914.
Coal mines and mining
> Safety measures.
"Publications on mine accidents and methods of mining": p. 21-22.
"August 1914"--T.p. verso.
At head of title: ... Department of the Interior. Bureau of Mines. Joseph A. Holmes, director.
22 p. :
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