au.\*:("DEASY GF")
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ATLAS OF PENNSYLVANIA'S MINERAL RESOURCES. PART 2-B, ECONOMICS OF PENNSYLVANIA'S CLAY AND SHALE PRODUCTION.DEASY GF; GRIESS PR.1969; PENNSYLVANIA TOPOGR. GEOL. SURV., BULL., M; USA; 1969, NUM. 002 , P. 1 A 25Miscellaneous