Columbia subject headings:
Poland--Foreign relations--1918-1945.
Poland--Foreign relations--Soviet Union.
Poland--History, Military--1918-
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--Poland.
Soviet Union--History, Military.
Harvard subject headings:
Poland--Foreign relations--Soviet Union
Poland--History, Military--1918-
Soviet Union--Foreign relations--Poland.
Soviet Union--History, Military.
Princeton subject headings:
Poland--Foreign relations--1918-1945.
Poland--Foreign relations--Soviet Union.
Poland--History, Military--1918-
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--Poland.
Soviet Union--History, Military.