Columbia subject headings:
Harvard subject headings:
Baltic literature--History and criticism--Congresses.
Nature in literature--Congresses.
Russian literature--19th century--History and criticism--Congresses
Russian literature--20th century--History and criticism--Congresses
Princeton subject headings:
Nature in literature--Congresses.
Russian literature--19th century--History and criticism--Congresses.
Russian literature--20th century--History and criticism--Congresses.