Leningrad Oblast
In 1929, Velikiye Luki Okrug was given to the newly formed Western Oblast. Leningrad was separated from Leningrad Oblast in December 1931. In 1935 five southernmost districts were made part of Kalinin Oblast. In 1936 some parts of the territory of Leningrad Suburban District of Leningrad was returned to Leningrad Oblast and divided into Vsevolozhsky District, Krasnoselsky District, Pargolovsky District and Slutsky District (renamed Pavlovsky District in 1944). Vologda Oblast was created out of Leningrad Oblast in 1937. Murmansk Oblast was split from Leningrad Oblast in 1938.