Columbia subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921--Criticism and interpretation.
Blok, Aleksandr Aleksandrovich, 1880-1921--Knowledge and learning.
Folklore.
Harvard subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921--Criticism and interpretation.
Blok, Aleksandr Aleksandrovich, 1880-1921--Knowledge--Folklore.
Princeton subject headings: