Columbia subject headings:
Poland--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Poland.
World War, 1939-1945--Poland.
World War, 1939-1945--Soviet Union.
Harvard subject headings:
Poland--Foreign relations--Soviet Union
Soviet Union--Foreign relations--Poland.
World War, 1939-1945--Poland.
World War, 1939-1945--Soviet Union.
Princeton subject headings:
Poland--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Poland.
World War, 1939-1945--Poland.
World War, 1939-1945--Soviet Union.