Columbia subject headings:
Germany (East)--Emigration and immigration.
Immigrants--Germany (East)
Harvard subject headings:
Foreign workers--Government policy--Germany (East)
Germany (East)--Emigration and immigration.
Immigrants--Germany (East)--History.
Immigrants--Germany (East)--Social conditions.
Princeton subject headings:
Germany (East)--Emigration and immigration.
Immigrants--Germany (East).