found: His Slováci v zahraničnom odboji, 1928:t.p. (Karol Sidor)
found: NUC, 1963-67(Sidor, Karol, 1901-1953)
found: Wikipédia, slobodná encyklopédia, March 29, 2017:Karol Sidor page (Karol Sidor; born 16 July 1901 in Ružomberok; died 20 October 1953 in Monteal; Slovak journalist and politician; member of the Hlinkova slovenská l̕udová strana and commander in the Hlinkova Garda; served minister without portfolio in the Czechoslovak government, 1938-1939; served as head of the Slovak Autonomous government, 11-14 March 1939; minister of the interior in the Slovak Republic, 14 March-18 April 1939; Slovak ambassador to the Vatican; 1939-1945; went into exile in 1945; founded the SNR [Slovenská národná rada v zahraničí] and served as its leader) - https://sk.wikipedia.org/wiki/Karol_Sidor
found: Moje poznámky k historickým dňom, 1971:title page (Karol Sidor) page 203 (became an exile in the Vatican in 1945; founded the Slovak National Council Abroad in 1948; emigrated to Montreal, Canada in 1950, where he died 20 October 1953)