The collection includes correspondence from Konstantin Balḿont, Nikolaĭ Evreĭnov, Zinaida Gippius, Georgiĭ Grebenshchikov, Vasiliĭ Maklakov, Sergeĭ Potresov and Nadezhda Teffi. There is one letter each from Boris Bakhmeteff, Vera Bunina, Aleksandr Grechaninov, Aleksandr Kuprin and Alekseĭ Tolstoĭ. The manuscripts include poems and a play scenario by Nadezhda Teffi as well as Roshchina-Insarova's autobiographical essays and article about Sergeĭ Lifar.́ In addition, there are three scrapbooks containing clippings and programs of Roshchina-Insarova's performances, and approximately 40 photographs of her.

The collection consists of correspondence, manuscripts of her diary, published under the title "Dnevnik, 1899-1906" (New York, 1951), documents (primarily personal), photographs chiefly taken in Manchuria at the turn of the century, and printed materials, especially clippings. The clippings include articles by Rossolimo, articles about her and members of her family, and about subjects of interest to her. The correspondence spans the years 1845-1952 but concentrates around 1951, the year of the publication of "Dnevnik, 1899-1906." Among the correspondents are Georgiĭ V. Adamovich, Vera N. Bunina, Anton and Ksenii︠a︡ Denikin, Georgiĭ P. Fedotov, Vasiliĭ A. Maklakov, among others. The diary raises issues of feminism and describes in detail the life of Russians in Manchuria, especially during the Russo-Japanese War.