Angkasiri Harnsiri และ Thanop Thitimakorn1. (2009) Resistivity Surveys for Assessing the Potential for Gem Deposits in Tambon Ploi Waen, Amphoe Tha Mai ,Changwat Chanthaburi. <i>Bulletin of Earth Sciences of Thailand (BEST)</i>, <i>2</i>(2-Jan), 93-94.Angkasiri Harnsiri และ Thanop Thitimakorn1. "Resistivity Surveys for Assessing the Potential for Gem Deposits in Tambon Ploi Waen, Amphoe Tha Mai ,Changwat Chanthaburi". Bulletin of Earth Sciences of Thailand (BEST) 2 (2009):93-94.Angkasiri Harnsiri และ Thanop Thitimakorn1. Resistivity Surveys for Assessing the Potential for Gem Deposits in Tambon Ploi Waen, Amphoe Tha Mai ,Changwat Chanthaburi. Department of Geology, Chulalongkorn University:ม.ป.ท. 2009.