Columbia subject headings:
Poland--Foreign relations--1918-1945--Congresses.
Poland--Relations--Ukraine--Congresses.
Pomerelia (Poland)--Ethnic relations.
Ukraine--Relations--Poland--Congresses.
Ukrainians--Poland--Pomerelia--History--20th century.
Harvard subject headings:
Pomerelia (Poland)--Ethnic relations.
Ukrainians--Poland--Pomerelia--History--20th century.
Princeton subject headings: