Columbia subject headings:
Russia--History--1801-1917--Bibliography.
Soviet Union--History--Bibliography.
Zaĭonchkovskiĭ, P. A. (Petr Andreevich)--Bibliography.
Harvard subject headings:
Russia--History--1801-1917--Bibliography.
Soviet Union--History--Bibliography.
Zaĭonchkovskiĭ, P. A. (Petr Andreevich)--Bibliography.
Princeton subject headings: