Columbia subject headings:
Harvard subject headings:
Russia--History--Nicholas II, 1894-1917--Sources.
Samarskai︠a︡ oblastʹ (Russia)--History--Sources.
Princeton subject headings:
Samarskai︠a︡ oblastʹ (Russia)--History--20th century--Sources.
World War, 1914-1918--Russia (Federation)--Samarskai︠a︡ oblastʹ--Sources.