Economic Survey of the Bituminous Coal Industry Under Free Competition and Code Regulation United States. National Recovery Administration. Division of Review Published: 1936 Total Pages: 910 Get eBook
Federal Coal-mine Inspection United States. Bureau of Mines. Coal Mine Inspection Branch Published: 1951 Total Pages: 66 Get eBook
Thirty Years in Coal, 1917-1947 Mining Association of Great Britain Published: 1954 Total Pages: 264 Get eBook