Columbia subject headings:
Germany (West)--Relations--Poland.
Katowice (Poland : Voivodeship)--Population.
Migration, Internal--Poland.
Opole (Poland : Voivodeship)--Population.
Poland--Relations--Germany (West)
Silesia (Poland : Voivodeship)--Population--Statistics.
Western and Northern Territories (Poland)--Population.
Wrocław (Poland : Voivodeship)--Population.
Harvard subject headings:
Germany (West)--Relations--Poland.
Katowice (Poland : Voivodeship)--Population.
Migration, Internal--Poland.
Opole (Poland : Voivodeship)--Population.
Poland--Relations--Germany (West)
Silesia (Poland : Voivodeship)--Population--Statistics.
Western and Northern Territories (Poland)--Population.
Wrocław (Poland : Voivodeship)--Population.
Princeton subject headings: