Columbia subject headings:
Harvard subject headings:
Migration, Internal--Social aspects--Eurasia--History.
Migration, Internal--Social aspects--Europe, Central.
Migration, Internal--Social aspects--Europe, Eastern.
Migration, Internal--Social aspects--Europe--History.
Migration, Internal--Social aspects--Russia.
Migration, Internal--Social aspects--Soviet Union.
Transportation--Social aspects--Eurasia--History.
Transportation--Social aspects--Europe--History.
Princeton subject headings:
Europe--Emigration and immigration.
Human trafficking.
Refugees--Europe.
Travelers--Europe.