Columbia subject headings:
Harvard subject headings:
Poland--History
Poland--History--Autonomy and independence movements
Poland--History--German occupation, 1914-1918
World War, 1914-1918--Poland
Princeton subject headings:
Poland. Armia
Poland. Legiony Polskie.
Poland. Wojsko Polskie
World War, 1914-1918--Participation, Polish.
World War, 1914-1918--Poland.