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1Published 1927New York, N.Y. : Keystone Division, McGraw-Hill Catalog and Directory Co., ©1927-©1929.3 volumes : illustrations, maps ; 29 cm.Subjects: “...Coal mines and mining United States Directories....”
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2Published 1930New York, N.Y. : McGraw-Hill Catalog and Directory Co., ©1930-©1932.3 volumes : illustrations, maps ; 28 cm.Subjects: “...Coal mines and mining United States Directories....”
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3Published 1935New York, N.Y. : McGraw-Hill Pub. Co., Catalog & Directory Division, ©1935-volumes : illustrations, maps ; 29 cm.Subjects: “...Coal mines and mining United States Directories....”
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4Published 1918Pittsburgh, Pa. : Keystone Consolidated Pub. Co., ©1918-©1926.7 volumes : illustrations ; 31 cm.Subjects: “...Coal mines and mining United States Directories....”