Columbia subject headings:
Freud, Sigmund, 1856-1939--Correspondence.
Osipov, Nikolaĭ Evgrafovich, 1877-1934--Correspondence.
Psychoanalysts--Correspondence.
Harvard subject headings:
Freud, Sigmund, 1856-1939--Correspondence.
Ossipow, Nikolaj J., 1877-1934--Correspondence.
Psychoanalysts--Austria--Correspondence
Psychoanalysts--Russia--Correspondence.
Princeton subject headings: