Columbia subject headings:
Harvard subject headings:
Communism--Poland--History--20th century
Poland--History--1945-1980--Chronology.
Poland--History--Occupation, 1939-1945--Chronology.
Poland--Politics and government--1918-1945
Poland--Politics and government--1945-1980
Princeton subject headings:
Communism--Poland--History--20th century.
Poland--History--1945-1980--Chronology.
Poland--History--Occupation, 1939-1945--Chronology.
Poland--Politics and government--1918-1945.
Poland--Politics and government--1945-1980.