Columbia subject headings:
Harvard subject headings:
Druzhinin, N. M. (Nikolaĭ Mikhaĭlovich), 1886-1986--Bibliography.
Druzhinin, N. M. (Nikolaĭ Mikhaĭlovich), 1886-1986.
Historians--Soviet Union--Bibliography.
History--Bio-bibliography.
Princeton subject headings:
Druzhinin, N. M. (Nikolaĭ Mikhaĭlovich), 1886-1986--Bio-bibliography.