Columbia subject headings:
Harvard subject headings:
Franco-Prussian War, 1870-1871--Causes
Socialism--France
Socialism--Germany
War and socialism.
World War, 1914-1918--Causes
Princeton subject headings:
Franco-Prussian War, 1870-1871--Causes.
Socialism--France.
Socialism--Germany.
War and socialism.
World War, 1914-1918--Causes.