Columbia subject headings:
Forced migration--Soviet Union--Congresses.
Forced migration--Ukraine--History--20th century--Congresses.
Minorities--Soviet Union--Congresses.
Political persecution--Ukraine--History--20th century--Congresses.
Ukrainians--Poland--History--Congresses.
Harvard subject headings:
Forced migration--Soviet Union--Congresses.
Forced migration--Ukraine--History--20th century--Congresses.
Minorities--Soviet Union--Congresses.
Political persecution--Ukraine--History--20th century--Congresses.
Ukrainians--Poland--History--Congresses.
Princeton subject headings: