Columbia subject headings:
Philosophy, Russian--20th century--Congresses.
Tugarinov, V. P. (Vasiliĭ Petrovich), 1898-1978--Congresses.
Harvard subject headings:
Philosophy, Russian--20th century--Congresses.
Tugarinov, V. P. (Vasiliĭ Petrovich), 1898-1978--Congresses.
Princeton subject headings: