au.\*:("SEMRAD R")
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ECONOMIC GEOLOGY OF THE MISHRAQ NATIVE SULFUR DEPOSIT, NORTHERN IRAQBARKER JM; COCHRAN DE; SEMRAD R et al.1979; ECON. GEOL.; USA; DA. 1979; VOL. 74; NO 2; PP. 484-495; BIBL. 12 REF.; 11 ILL.Conference Paper
