Columbia subject headings:
World War, 1914-1918--Campaigns.
World War, 1914-1918--Poland.
Harvard subject headings:
Poland--History--Austrian occupation, 1915-1918
Poland--History--German occupation, 1914-1918
World War, 1914-1918--Poland
World War, 1914-1918.
Princeton subject headings:
World War, 1914-1918--Campaigns.
World War, 1914-1918--Poland.