found: Wulkany Kivu, 1934:t.p. (Leon Xia̜że̜ Sapieha)
found: OCLC, Mar. 27, 2014(hdgs.: Sapieha, Leon, 1883-1944; Sapieha, Leon; Sapieha, Leon, Prince, 1883-1944; Sapieha, Leon ksia̜że̜; Saipeha, Leon, Ks.; usage: Leon Sapieha)
found: Wikipedia, Mar. 27, 2014(Leon Aleksander Sapieha; Prince Leon Aleksander Sapieha (1883-1944), Polish military aviator, landowner, traveler, member of the Sejm [lower house of Polish parliament]; b. Krasiczyn, Poland, Dec. 12, 1883; d. Rzeszow, Poland, Sep. 27, 1944)