Duangdorm Sinsooksakul. (2000) The dissemination of soil information via the Internet : a case study Chiang Rai province. Mahidol University,:ม.ป.ท.Duangdorm Sinsooksakul. 2000. The dissemination of soil information via the Internet : a case study Chiang Rai province. ม.ป.ท.:Mahidol University,;Duangdorm Sinsooksakul. The dissemination of soil information via the Internet : a case study Chiang Rai province. ม.ป.ท.:Mahidol University, 2000. Print.