Mitrofanova's manuscripts consist of four bound typescripts: memoirs about her son, Oleg P. Mitrofanov, and the Preobrazhenskiĭ Regiment in World War I; and two essays on the White Cross, entitled "Beloe dvizhenie i Belyĭ Krest"́ and "Belyĭ Krest ́v izgnanii." Also included is Oleg Mitrofanov's diary, which covers his service in the Preobrazhenskiĭ guard in January-July 1917.

The papers consist primarily of the Kosatkin-Rostovskiĭ's memoirs. His manuscript memoirs (150 p.) discuss his life up to 1906. Her typescript memoirs (440 p.) discuss her childhood, career as an actress in St. Petersburg, 1917-1918 in Petrograd, and the emigration in France. Also included are his diary for June-July 1940; a few letters written to him; clippings of his newspaper articles (many signed with the pseudonym "Antar"); and a book with his poetry and with essays dedicated to him; "Krestnym putem k voskresenii︠u︡" (Paris, 1948).