Search History Select to load keywords (type equals "Thesis") AND (dateIssued equals "[1957 TO 1999]") AND (subject equals "โพลิเมอไรเซชัน") AND (subject equals "Catalysts") AND (subject equals "Hexane") AND (subject equals "โพลิเอทิลีน") AND (subject equals "Polyethylene") AND (dateIssued equals "1998")
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