Columbia subject headings:
Migration, Internal--Soviet Union.
Soviet Union--Population.
Urbanization--Soviet Union.
Harvard subject headings:
Cities and towns--Russia (Federation)
Cities and towns--Soviet Union.
Migration, Internal--Soviet Union
Population density--Russia (Federation)
Population density--Soviet Union.
Soviet Union--Population.
Urbanization--Soviet Union.
Princeton subject headings:
Migration, Internal--Soviet Union.
Soviet Union--Population.
Urbanization--Soviet Union.