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<xml><bibliography><APA>Woraprach Jarupan. (2000) Effects of lead and humic acid on duckweed, Lemna minor. Mahidol University,:ม.ป.ท.</APA><Chicago>Woraprach Jarupan. 2000. Effects of lead and humic acid on duckweed, Lemna minor. ม.ป.ท.:Mahidol University,;</Chicago><MLA>Woraprach Jarupan.  Effects of lead and humic acid on duckweed, Lemna minor.  ม.ป.ท.:Mahidol University, 2000. Print.</MLA></bibliography></xml>
