Columbia subject headings:
Warsaw (Poland)--History--20th century.
World War, 1914-1918--Social aspects--Poland--Warsaw.
Harvard subject headings:
Warsaw (Poland)--History--20th century.
World War, 1914-1918--Social aspects--Poland--Warsaw.
Princeton subject headings:
Warsaw (Poland)--History--20th century.
World War, 1914-1918--Social aspects--Poland--Warsaw.