Columbia subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921.
Drama--20th century--History and criticism.
Russian drama--20th century--History and criticism.
Harvard subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921
Drama--20th century--History and criticism
Russian drama--20th century--History and criticism.
Princeton subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921.
Drama--20th century--History and criticism.
Russian drama--20th century--History and criticism.