Columbia subject headings:
Harvard subject headings:
Allied and Associated Powers (1914-1920). Treaties, etc.--Congresses.
Austro-Hungarian Monarchy. Heer--History--Congresses.
Bulgaria. Armii︠a︡--History--Congresses.
World War, 1914-1918--Congresses
Princeton subject headings:
Allied and Associated Powers (1914-1920). Treaties, etc.--Congresses.
Austro-Hungarian Monarchy. Heer--History--Congresses.
Bulgaria. Armii︠a︡--History--Congresses.
World War, 1914-1918--Congresses.