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http://freelllprogram.blogspot.com/ sketch-up.html
http://www.kr.ac.th/wai/show.php?id=
http://www.trueplookpanya.com/true/knowledge_detail.php?mul_content_id=1583
http://www.minitutor.com/html/tutor_nuntadej.html
http://www.bloggang.com/mainblog.php?id=baansuansabuy&month=31-10-2009&group=4&gblog=7