Books by R. G. Warncke:
Books in the extended shelves:
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Warncke, R. G. (Russell G.): Hazards of the trolley-locomotive haulage system in coal mines (U.S. Dept. of the Interior, Bureau of Mines, 1945), also by D. Harrington (page images at HathiTrust)- Warncke, R. G. (Russell G.): Some of the hazards of auxiliary fans in coal mines (U.S. Dept. of the Interior, Bureau of Mines, 1944), also by D. Harrington (page images at HathiTrust)
Find more by R. G. Warncke at your library, or elsewhere.