Columbia subject headings:
Harvard subject headings:
Catholic Church--Poland--History--20th century.
Jews--Poland--History--20th century.
Minorities--Poland--History--20th century.
Poland--Ethnic relations--History--20th century.
Princeton subject headings:
Catholic Church--Poland--History--20th century.
Jews--Poland--History--20th century.
Minorities--Poland--History--20th century.
Poland--Ethnic relations--History--20th century.