Correspondence of Trubet︠s︡kai︠a︡. The correspondence in this collection relates to the family of Trubet︠s︡kai︠a︡ as well as to the family of Marii︠a︡ I︠A︡. Gagarina. There are letters from Aleksandr Benois, Mikhail Girs, Count Karl Nesselrode, Boris Nold́e, Ivan Shmelev, Petr Struve, Alekseĭ K. Tolstoĭ and Natalie, queen consort of Milan I of Serbia. There are also arranged letters and an unsigned manuscript discussing the Russo-Turkish War of 1828.

Correspondence, manuscripts, documents, photographs, subject files, printed materials, and memorabilia of historian George Vernadsky (Georgii Vladimirovich Vernadskii; 1887-1973). Most of the collection consists of his personal and professional papers, circa 1918-1973. Sizable groups of materials also concern members of his family, especially his wife Nina (1884-1971); his father, scientist Vladimir I. Vernadskii (1863-1945); his mother Nataliia E. Vernadskaia (1860-1943); and his sister Nina V. Toll' (1898-circa 1976).