Mitchell, David Ray 1898- creator McCabe, Louis Cordell 1904- joint author. Illinois State Geological Survey Illinois University of Illinois. text ilu Urbana, Illinois 1937 monographic eng

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84 p. illus. by D. R. Mitchell and L. C. McCabe. At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey. In cooperation with the Engineering Experiment Station, University of Illinois. Coal Testing Coal Illinois TN816 .M55 gs 38000135 DLC 790608 20260227111343.0 gs 38000135