Reports of the Inspectors of Coal Mines of Pennsylvania.
Report of the Bureau of Mines of the Department of Internal Affairs of Pennsylvania
Reports of the Inspectors of Mines of the anthracite and bituminous coal regions of Pennsylvania, for the year ...
[Harrisburg] : C.M. Busch, State printer of Pennsylvania, 1894-1897.
Coal mines and mining
"With a summary of coal production, etc., prepared by the Bureau of Industrial Statistics, Department of Internal Affairs."
4 v. :
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