Columbia subject headings:
Demography--Poland--History--20th century--Statistics.
Demography--Poland--History--20th century.
Poland--Population--History--20th century--Statistics.
Poland--Population--History--20th century.
Łódź (Poland : Voivodeship)--Population--History--20th century--Statistics.
Łódź (Poland : Voivodeship)--Population--History--20th century.
Harvard subject headings:
Demography--Poland--20th century.
Poland--Population--20th century.
Łódź (Poland : Region)--Population--History--20th century.
Princeton subject headings: