Columbia subject headings:
Harvard subject headings:
Rennenkampf, Pavel Karlovich, 1854-1918.
Russia. Armii͡a--History--World War, 1914-1918.
Russia. Armii︠a︡. Armii︠a︡, 1-i︠a︡
World War, 1914-1918--Campaigns--Eastern Front
World War, 1914-1918--Prussia, East (Poland and Russia)
Princeton subject headings:
Rennenkampf, Pavel Karlovich, 1854-1918.
Russia. Armii︠a︡--History--World War, 1914-1918.
Russia. Armii︠a︡. Armii︠a︡, 1-i︠a︡
World War, 1914-1918--Campaigns--Eastern Front.
World War, 1914-1918--Prussia, East (Poland and Russia).