Search History Select to load keywords (dateIssued equals "[1957 TO 1999]") AND (subject equals "Polystyrene") AND (author equals "Ratthakrai Sirisook, author") AND (subject equals "สารช่วยผสม") (subject equals "Academic achievement") AND (subject equals "Mathematics -- Study and teaching") AND (subject equals "การจูงใจ (จิตวิทยา)") AND (subject equals "Motivation (Psychology)")
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