There are letters from fellow historians, such as John Franklin Jameson and Aleksandr Lappo-Danilevskiĭ; Kadet Party leaders, including Vladimir D. Nabokov and Nikolaĭ Astrov; and others such as Boris Bakhmeteff, Charles Crane, Vladimir Jabotinsky, Louis Marshall, Thomas Masaryk, and Nikolaĭ Roerich. A large correspondence series consists of letters and petitions sent to Miliukov during the Third State Duma (1907-12). Manuscripts include Mili︠u︡kov's memoirs, and his notebooks from the period of the Civil War. There is also a manuscript by Isaak Shkovskiĭ (pseudonym -- Dioneo) on Russian writers and journalists during World War I. Subject files deal with the State Duma, the Civil War, and the emigration.

The papers consist of correspondence, manuscripts, documents, subject files, photographs, and printed materials, and chiefly concern the post-1917 emigration; the Rodichevs settled in Switzerland. There is a great deal of family correspondence, including letters from Fedor I. Rodichev to his wife and daughter, letters from their niece Nina Vernadsky (Mrs. George), and from relatives in Soviet Russia in the 1920s and 1930s. There are many letters by Fedor I. Rodichev to Ivan and Anastasii︠a︡ Petrunkevich, and to Natalii︠a︡ Herzen fille. There are also letters to the Rodichevs from such Kadet leaders as Nikolaĭ Astrov, I︠O︡sif Gessen, Vasiliĭ Maklakov, Pavel Mili︠u︡kov, Sofii︠a︡ Panina, and Ivan Petrunkevich, and items by Aleksandr I. Herzen, Nikolaĭ Ogarev, and Ignacy Jan Paderewski. Manuscripts include memoirs and other writings, with many notes and fragments, written by Fedor Rodichev while in exile. There is also Aleksandra Rodicheva's biography of her father, and materials used by Kermit McKenzie to prepare his edition of Fedor Rodichev's memoirs. Subject files concern such topics as the Russian Civil War, the emigration, and the Rodichev and Herzen families. Among the photographs, which are chiefly of the Rodichevs and their friends and relatives, are two portraits of Giuseppe Garibaldi. Printed materials include clippings and offprints of works by Fedor Rodichev, and some books by, or relating to, members of the Herzen family.

Most of the collection concerns the Russian emigration in interwar Europe; a sizeable part deals with the Kadet (Constitutional Democrat) Party in the Russian Civil War. There is correspondence, manuscripts, subject files, photographs, and printed materials. There are many letters by liberal figures, such as Astrov, Viktor Chelishchev, Petr I︠U︡renev, Aleksandr Kizevetter, Pavel Mili︠u︡kov, Vladimir D. Nabokov, Vladimir Obolenskiĭ, Panina, and Ivan Petrunkevich. There are also letters from Ivan Bilibin, Alice Masaryk, and Thomas Masaryk. Manuscripts are chiefly by Astrov, and include memoirs, poems, and lectures. There are also memoirs by Panina, and eulogies by various people on Astrov. Subject files from 1917-1920 have materials on Panina's arrest and trial by the Bolsheviks, Kadet conferences, protocols of meetings of the Kadet Party central committee, and other items. Files on the emigration deal with the Russkiĭ Ochag (Russian Hearth) and other bodies, especially in Czechoslovakia. There are photographs of Astrov, Kizevetter, Nikodim Kondakov, Alice Masaryk, Panina, and others. Printed materials include books, clippings, and offprints by Astrov and others.

The papers consist primarily of the manuscripts of books (including "Witte"), articles, and lectures by V.K. Korostovet︠s︡. There are one or two letters each from Dmitriĭ Mendeleev, Maksim Gorḱiĭ, Pavel Skoropadskiĭ, Boris Pilńi︠a︡k, Konstantin Pobedonost︠s︡ev, Hilaire Belloc, Evelyn Waugh, Rudyard Kipling, John Maynard Keynes, Pavel Mili︠u︡kov, and Lewis Mumford.