Columbia subject headings:
Historians--Russia (Federation)--Biography.
Russia--History--1801-1917.
Zyri︠a︡nov, P. N. (Pavel Nikolaevich)
Harvard subject headings:
Russia--History--1801-1917.
Zyri︠a︡nov, P. N. (Pavel Nikolaevich)--Bibliography.
Princeton subject headings: