Columbia subject headings:
Russia--History--February Revolution, 1917.
Soviet Union--History--Revolution, 1917-1921.
Swiss--Russia--Biography.
Swiss--Soviet Union--Biography.
Harvard subject headings:
Narbel, Julien--Correspondence.
Narbel-Delessert, Eugénie--Correspondence.
Personal correspondence.
Russia--History--February Revolution, 1917.
Soviet Union--History--Revolution, 1917-1921.
Swiss--Russia--Biography.
Swiss--Soviet Union--Biography.
Princeton subject headings: