Singtuen, V. and Won-In, K. 2019. Geoheritage Sites and Geoconservation at Pha Chan – Sam Phan Bok Geopark, Ubon Ratchathani Province, Thailand. Geoconservation Research. 2, 1 (Dec. 2019). DOI:https://doi.org/10.30486/gcr.2019.664490.