Collection includes 19 manuscript notebooks of poetry and prose; 42 titled articles in typescript form on religious, political, literary and autobiographical topics; several published collections of her poetry; and a folder of original drawings. Also included are three biographical articles by K. Mochulśkiĭ, M. Vishni︠a︡k and her mother Sofii︠a︡ Borisovna Pilenko, as well as her own childhood and that of her mother and grandmother during the era of Alexander I, Nicholas I, and Alexander II.

Correspondence, manuscripts, documents, photographs, artwork, objects, and printed material. Included among the list of 37 cataloged correspondents are: Vera Brittain, Edward Gordon Craig, Clarence Darrow, Havelock Ellis, Augustus John, Emmeline Pankhurst, Edward Steichen, Gertrude Stein, Algernon Charles Swinburne, Sybil Thorndike, Alec Waugh, and H. G. Wells. The cataloged manuscripts include a poem by Witter Bynner entitled "Hay Wagon." There is a large selection of Stephen's writings (poetry, novels, plays, articles, biographies, memoirs) including drafts of a proposed biography of his father, a bound volume of his own memoirs, numerous notebooks, and "Mount Joy," a description of life on Dominica. His photographs and paintings are well represented, with 6 albums of photographs and 2 boxes & 1 folder of approximately 200 paintings and sketches. The printed material includes works by Stephen, his father and his mother.