Columbia subject headings:
Harvard subject headings:
Blok, Aleksandr Aleksandrovich, 1880-1921
Russia--Intellectual life--1801-1917.
Solovʹev, S. M. (Sergeĭ Mikhaĭlovich), 1885-1942.
Princeton subject headings:
Authors, Russian--20th century--Biography.
Blok, Aleksandr Aleksandrovich, 1880-1921.
Solovʹev, S. M. (Sergeĭ Mikhaĭlovich), 1885-1942.