Columbia subject headings:
Historians--Russia--Bibliography.
Historians--Soviet Union--Bibliography.
Pokrovskiĭ, M. N. (Mikhail Nikolaevich), 1868-1932--Bibliography.
Harvard subject headings:
Historians--Russia--Bibliography.
Historians--Soviet Union--Bibliography.
Pokrovskiĭ, M. N. (Mikhail Nikolaevich), 1868-1932--Bibliography.
Princeton subject headings:
Historians--Russia--Bibliography.
Historians--Soviet Union--Bibliography.