Search History Select to load keywords (type equals "Thesis") AND (dateIssued equals "[1957 TO 1999]") AND (subject equals "Surface active agents") AND (subject equals "Flotation") AND (subject equals "สารลดแรงตึงผิว") AND (author equals "Penny Ratanarojanatam") (author equals "นิกร ดุสิตสิน") AND (dateIssued equals "[2540 TO 2546]") AND (subject equals "เพศสัมพันธ์") AND (subject equals "เพศสัมพันธุ์ก่อนการสมรส")
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