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   <subfield code="a">Khảo sát tình hình sâu hại trên cây hành tím và nghiên cứu biện pháp phòng trừ sinh học đối với sâu xanh da láng,Spodoptera exigua (Hubner),tại huyện Vĩnh châu tỉnh Sóc Trăng :</subfield>
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   <subfield code="a">Trung tâm Học liệu Trường Đại học Cần Thơ</subfield>
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