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