Columbia subject headings:
Harvard subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921
Blok, Aleksandr Aleksandrovich, 1880-1921--Correspondence.
Blok, Aleksandr Aleksandrovich, 1880-1921--Diaries.
Poets, Russian--20th century--Biography
Princeton subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921.