Columbia subject headings:
Harvard subject headings:
World War, 1914-1918--Austria--Lower Austria--Causes--Congresses.
World War, 1914-1918--Austria--Lower Austria--Causes--Exhibitions.
World War, 1914-1918--Europe--Causes--Congresses.
World War, 1914-1918--Europe--Causes--Exhibitions.
World War, 1914-1918--Social aspects--Austria--Congresses.
World War, 1914-1918--Social aspects--Austria--Exhibitions.
World War, 1914-1918--Social aspects--Europe--Congresses.
World War, 1914-1918--Social aspects--Europe--Exhibitions.
Princeton subject headings:
World War, 1914-1918--Austria--Lower Austria--Causes--Congresses.
World War, 1914-1918--Austria--Lower Austria--Causes--Exhibitions.
World War, 1914-1918--Europe--Causes--Congresses.
World War, 1914-1918--Europe--Causes--Exhibitions.
World War, 1914-1918--Social aspects--Austria--Congresses.
World War, 1914-1918--Social aspects--Austria--Exhibitions.
World War, 1914-1918--Social aspects--Europe--Congresses.
World War, 1914-1918--Social aspects--Europe--Exhibitions.