Columbia subject headings:
Harvard subject headings:
World War, 1914-1918--Collectibles--Austria.
World War, 1914-1918--Collectibles--Germany.
World War, 1914-1918--Europe.
Princeton subject headings:
World War, 1914-1918--Collectibles--Austria.
World War, 1914-1918--Collectibles--Germany.
World War, 1914-1918--Europe.