Columbia subject headings:
Althoff, Friedrich, 1839-1908.
Germany--History--1871-1918.
World War, 1914-1918.
Harvard subject headings:
Althoff, Friedrich, 1839-1908.
Germany--History--1871-1918.
World War, 1914-1918
Princeton subject headings:
Althoff, Friedrich, 1839-1908.
Germany--History--1871-1918.
World War, 1914-1918.