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Donald Ammons, Center, Safety Inspector, Christopher Coal Co., conducts Dr. Miles  J. Martin, Left, Chief, Office of Mineral Information, Washington, D.C., and John D. Spencer, Morgantown Coal Research Center, on tour of Christopher Coal Co. Mine No. 15, at Cassville, W. Va. 'U.S. Bureau of Mines Photo Proof Print. Not for publication, permanent record, or other use outside of the Morgantown Research Center.