Columbia subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921--Criticism and interpretation.
Cycles (Literature)
Harvard subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921--Literary style.
Blok, Aleksandr Aleksandrovich, 1880-1921--Technique.
Princeton subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921--Criticism and interpretation.
Cycles (Literature)