Columbia subject headings:
Catholic Church--Poland--History.
Poland--Ethnic relations--History.
Poland--Relations--Ukraine.
Polish people--Ukraine--History.
Ukraine--Ethnic relations--History.
Ukraine--Relations--Poland.
Harvard subject headings:
Poland--Ethnic relations
Poland--Relations--Ukraine
Polish people--Ukraine--History.
Ukraine--Ethnic relations.
Ukraine--Relations--Poland.
Ukrainians--Poland--History.
Princeton subject headings: