Correspondence of Andrei Bely (1880-1934) with an outstanding literary critic, publicist, literary historian Ivanov-Razumnik (1878-1946) - the largest epistolary complex in volume and rich in content, covering the second half of the life and creative activity of the largest symbolist writer. Correspondence is a necessary addition to the memoirs of Andrei Bely and at the same time a rich source of diverse information about the Russian literary life of the 1910-1920s.