found: Novikov, V. M. Lateritnye i osadochnye boksity Mugadzhar i Orskogo zauralʹi︠a︡, 1980:p. 11 (Orenburgskui︠u︡ oblastʹ RSFSR)
found: BGN postal reply 10/1/81(Orenburgskaya oblastʹ, 52°00ʹN 56°OOʹE, 2nd order admin. div.; variants: Chkalovskaya Oblastʹ ; Chkalov Oblast)
found: Bolʹsh. sov. ėnt︠s︡ikl., 3rd ed.: v. 18(Orenburgskai︠a︡ oblastʹ; established 12/7/1934 from part of Srednevolzhskiĭ kraĭ; from 1938-1957 named Chkalovskai︠a︡ oblastʹ; 1958 Orenburgskai︠a︡ oblastʹ)
found: Kraĭ stepnoĭ Orenburzhʹe, 1983:t.p. (Orenburzhʹe)
found: GEOnet WWW, 11-19-96(hdg.: Orenburgskaya oblast': ADM2, 52°00ʹ00ʺN, 56°00ʹ00ʺE)
found: RSFSR, admin.-territ. delenie, 1986:p. 308 (Orenburgskai︠a︡ oblastʹ; established 12/07/1934. From 12/26/1938 to 12/04/1957 called Chkalovskai︠a︡ oblastʹ)
found: Sergeĭ Kalmykov = Sergei Kalmikov, 2014:t.p. (Правительство Оренбургской области = Pravitelʹstvo Orenburgskoĭ oblasti)
found: GEOnet, July 15, 2021(Orenburgskaya Oblastʹ (Approved); Orenburg Oblast (Anglicized Variant); Оренбургская Область (Non-Roman Script) = Orenburgskai︠a︡ Oblastʹ; Chkalov Oblast (Variant); Chkalovskaya Oblastʹ (Variant); first-order administrative division, Russia, 52°00ʹ00ʺ N, 056°00ʹ00ʺ E (52, 56))
found: Wikipedia, July 15, 2021(Orenburg Oblast (Russian: Оренбургская область = Orenburgskai︠a︡ oblastʹ, Orenburgskaya oblast [in roman]) is a federal subject of Russia (an oblast). Its administrative center is the city of Orenburg. From 1938 to 1957, it bore the name Chkalov Oblast (Чкаловская область = Chkalovskai︠a︡ oblastʹ) in honor of Valery Chkalov; 52°08ʹN 55°36ʹE)
notfound: Its Sekskursieĭ po Chkalovskoĭ oblasti, 1949;LC data base, 11-19-96 (hdg.: Srednevolzhskiĭ kraĭ (R.S.F.S.R.))
