สุวานิช ป. The Studying Potassium Bromide Profile (KBr profile) of Drilledholes K-68 and K-70 in Nachueak District, Maha Sarakham Province to Prove the Overturn Bed of Rock Salt and Potash Bed in Maha Sarakham Formation by Comparative KBr Contents with a Normal Bed. KKU Sci. J. 2013, 41, 756-769.