Duangjai, Kittiya. 2019. “APPLICATION OF CHEMISTRY TO CONSTRAIN TYPE OF PROTOLITHS AND METAMORPHISM CONDITIONS OF THE HOST ROCKS OF FLUORITE MINE AT KHAO CHONG INSI, KANCHANABURI PROVINCE, THAILAND”. Research Journal Phranakhon Rajabhat : Science and Technology 15 (2):63-75. https://li01.tci-thaijo.org/index.php/PRRJ_Scitech/article/view/193029.