Columbia subject headings:
Baltic Provinces (Russia)
Bulgaria.
Soviet Union--Description and travel.
Soviet Union--Politics and government--1917-1936.
Turkey--Politics and government--1918-1960.
Harvard subject headings:
Baltic Provinces (Russia)
Bulgaria
Soviet Union--Description and travel.
Soviet Union--Politics and government--1917-1936.
Turkey--Politics and government--1918-
Turkey--Politics and government--1918-1960.
Princeton subject headings: