Search History Select to load keywords (subject equals "Polyethylene") AND (subject equals "โพลิเอทิลีน") AND (subject equals "ตัวเร่งปฏิกิริยา") AND (author equals "Chongkiat Visetjung") (dateIssued equals "[1996 TO 1999]") AND (dateIssued equals "1999")
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