Columbia subject headings:
Belarusians--Poland--History--20th century.
Germans--Poland--History--20th century.
Lithuanians--Poland--History--20th century.
Poland--Ethnic relations.
Ukrainians--Poland--History--20th century.
Harvard subject headings:
Belarusians--Poland.
Germans--Poland
Lithuanians--Poland.
Minorities--Poland--History--20th century.
Poland--Ethnic relations
Ukrainians--Poland.
Princeton subject headings: