Columbia subject headings:
World War, 1914-1918--Germany--Influence.
World War, 1914-1918--Spain--Influence.
Harvard subject headings:
Art, German--20th century--Congresses.
Art, Spanish--20th century--Congresses.
German literature--20th century--History and criticism--Congresses
Spanish literature--20th century--History and criticism--Congresses
World War, 1914-1918--Art and the war--Congresses.
World War, 1914-1918--Literature and the war--Congresses.
Princeton subject headings:
Art, German--20th century--Congresses.
Art, Spanish--20th century--Congresses.
German literature--20th century--History and criticism--Congresses.
Spanish literature--20th century--History and criticism--Congresses.
World War, 1914-1918--Art and the war--Congresses.
World War, 1914-1918--Literature and the war--Congresses.