URN:NBN:SI:doc-VOTIDCES2021Kranjc, Andrejdocuments/doc/V/URN_NBN_SI_doc-VOTIDCES_001.pdfdocuments/doc/V/URN_NBN_SI_doc-VOTIDCES_001.txt150articlestr. 195-1970583-605010.3986/ac.v50i1.1008470039299URN:NBN:SI:doc-VOTIDCESengSlovenska akademija znanosti in umetnostiActa carsologicaBY-NC-NDkarst caveskraške jameLupša, FerdinandraziskovanjeresearchTajskaThailandFerdo Lupša (1882-1945)letterone of the first Western researchers of caves in Thailand