Sakchai Juanngam. (2014) A new locality of well-preserved silicified Early Permian brachiopods in Loei province, NE Thailand. <i>Journal of SCIENCE and TECHNOLOGY Mahasarakham University</i>, <i>33</i>(4), 403-411.Sakchai Juanngam. "A new locality of well-preserved silicified Early Permian brachiopods in Loei province, NE Thailand". Journal of SCIENCE and TECHNOLOGY Mahasarakham University 33 (2014):403-411.Sakchai Juanngam. A new locality of well-preserved silicified Early Permian brachiopods in Loei province, NE Thailand. Mahasarakham University:ม.ป.ท. 2014.