Columbia subject headings:
Germany (East)--Population.
Soviet Union--Population.
Urbanization--Germany (East)
Urbanization--Soviet Union.
Harvard subject headings:
Population density--Germany (East)
Population density--Soviet Union.
Urbanization--Germany (East)
Urbanization--Soviet Union.
Princeton subject headings:
Germany (East)--Population.
Soviet Union--Population.
Urbanization--Germany (East).
Urbanization--Soviet Union.