Columbia subject headings:
World War, 1914-1918--Battlefields.
World War, 1914-1918--Public opinion.
World War, 1914-1918--Veterans--Travel.
Harvard subject headings:
World War, 1914-1918--Battlefields
World War, 1914-1918--Public opinion
World War, 1914-1918--Veterans--Travel.
Princeton subject headings:
Battlefields.
World War, 1914-1918--Battlefields.
World War, 1914-1918--Influence.
World War, 1914-1918--Veterans--Travel.