Columbia subject headings:
Poland--Relations--Ukraine.
Ukraine, Western--History--Autonomy and independence movements.
Ukraine--History--1917-1921.
Ukraine--Relations--Poland.
Ukrainians--Poland--History--20th century.
Harvard subject headings:
Poland--Relations--Ukraine
Ukraine, Western--History--Autonomy and independence movements.
Ukraine--History--1917-
Ukraine--Relations--Poland
Ukrainians--Poland--History--20th century.
Princeton subject headings: