Natakam, S. and Laowansiri, S. (2018) “WATER QUALITY ANALYSIS FOR RECREATIONAL WATERFALLS OF PHU RUEA NATIONAL PARK, LOEI PROVINCE”, Life Sciences and Environment Journal, 19(2), pp. 358-368. vailable at: https://ph01.tci-thaijo.org/index.php/psru/article/view/111606 (ccessed: 29November2021).