Collection Abram Saulovich Kagan Papers, 1909-1952 Online Repository Columbia University: Rare Book & Manuscript Library
Collection Boris Petrovich Vysheslavtsev Papers, 1920-1954 Repository Columbia University: Rare Book & Manuscript Library
Collection Semen Liudvigovich Frank Papers, 1898-1975 Repository Columbia University: Rare Book & Manuscript Library
Collection Sergei Grigor'evich Svatikov Papers, 1860-1950 Repository Columbia University: Rare Book & Manuscript Library