Search History Select to load keywords (subject equals "Polyethylene") AND (subject equals "โพลิเอทิลีน") AND (subject equals "ตัวเร่งปฏิกิริยา") AND (dateIssued equals "1998") AND (subject equals "Hexane") (subject equals "Catalysts") AND (subject equals "Ethanol") AND (author equals "Tanakrit Rugwong") AND (subject equals "เบนซิน") AND (subject equals "Ethylbenzene")
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