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 (author equals "Penny Ratanarojanatam") AND (subject equals "โฟลเทชัน") (subject equals "ผลสัมฤทธิ์ทางการเรียน") AND (subject equals "ภาษาอังกฤษ -- การศึกษาและการสอน (ประถมศึกษา)") AND (author equals "วัฒนารี ทวิวรดิลก") AND (dateIssued equals "2539")
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