1.
Singtuen V, Won-In K. Geoheritage Sites and Geoconservation at Pha Chan – Sam Phan Bok Geopark, Ubon Ratchathani Province, Thailand. Geoconserv. Res. 2019 Dec. 1;2(1). Available from: http://oiccpress.com/gcr/article/view/2728