Prakainetra Insai. (1999) Holocene diatom analysis of the Bangkok clay. Mahidol University,:ม.ป.ท.Prakainetra Insai. 1999. Holocene diatom analysis of the Bangkok clay. ม.ป.ท.:Mahidol University,;Prakainetra Insai. Holocene diatom analysis of the Bangkok clay. ม.ป.ท.:Mahidol University, 1999. Print.