Columbia subject headings:
Harvard subject headings:
Poland--Foreign relations--1918-1945--Congresses.
Poland--History--Wars of 1918-1921--Congresses.
Poland--Politics and government--1918-1945--Congresses.
Princeton subject headings:
Poland--Foreign relations--1918-1945--Congresses.
Poland--Politics and government--1918-1945--Congresses.