The bulk of collection consists mostly of letters to a well known Russian ballet dancer and choreographer Leonide Massine (Leonid Fedorovich Miasin) from prominent Russian émigré dancers, composers, writers and artists, such as Alexandre Benois, Naum Gabo, Vernon Duke, Wassily Kandinsky, Serge Lifar, Nikolai Minskii, Evgenii Zamiatin and others. Also includes Massine's lecture, notes for various ballet productions, documents and financial matters. Related to several BAR collections: Dobuzhinsky Papers, Zamiatin Papers, and Shervashidze Papers.

Correspondence, manuscripts, documents, photographs, subject files, and printed materials belonging to Russian émigré artist and collector Nikolai Vasil'evich Zaretskii (1876-1959). The collection is a mixture of materials created by or for Zaretskii, and materials collected by him.