Columbia subject headings:
Harvard subject headings:
Poland--History--Occupation, 1939-1945--Congresses.
Polish people--Soviet Union--Congresses.
World War, 1939-1945--Deportations from Poland--Congresses.
World War, 1939-1945--Poland--Congresses.
World War, 1939-1945--Refugees--Poland--Congresses.
Princeton subject headings:
Deportation--Poland--History--20th century.
Deportation--Soviet Union--History--Congresses.
Forced migration--Soviet Union--History--Congresses.
Polish people--Soviet Union--History.
World War, 1939-1945--Deportations from Poland--Congresses.
World War, 1939-1945--Deportations from Poland.