Columbia subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921.
Russian literature--19th century.
Harvard subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921
Russian literature--19th century
Russian literature--19th century--History and criticism
Princeton subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921.
Russian literature--19th century.