Columbia subject headings:
Harvard subject headings:
Asia, Central--Historical geography.
Eastern question (Far East)
Geopolitics--Soviet Union.
Mackinder, Halford John, 1861-1947.
Russian Far East (Russia)--Historical geography.
Soviet Union--Historical geography.
Princeton subject headings:
Asia, Central--Historical geography.
Eastern question (Far East)
Geopolitics--Soviet Union.
Mackinder, Halford John, 1861-1947.
Russian Far East (Russia)--Historical geography.
Soviet Union--Historical geography.