Shigeki Hada และ Somboon Khosithanont;Hiroya Goto. (2020) A remarkable end-Permian boulder bed of conglomeratic at Nam Nao in NE Thailand: its biostratigraphical and environmental significance limestone. <i>Thai Geoscience Journal</i>, <i>1</i>(1), 1-17.Shigeki Hada และ Somboon Khosithanont;Hiroya Goto. "A remarkable end-Permian boulder bed of conglomeratic at Nam Nao in NE Thailand: its biostratigraphical and environmental significance limestone". Thai Geoscience Journal 1 (2020):1-17.Shigeki Hada และ Somboon Khosithanont;Hiroya Goto. A remarkable end-Permian boulder bed of conglomeratic at Nam Nao in NE Thailand: its biostratigraphical and environmental significance limestone. Department of Mineral Resources of Thailand:ม.ป.ท. 2020.