The collection consists chiefly of correspondence and papers of Rosika Schwimmer (1877-1948), Lola Maverick Lloyd (1875-1944) and their associates relating to their work for the European and American feminist movements, woman suffrage, World War I mediation efforts, international peace and world government. Correspondents include hundreds of notable Americans and Europeans such as Jane Addams, Anita Augspurg, Emily G. Balch, Mary R. Beard, Carrie Chapman Catt, Albert Einstein, Lida Gustava Heymann, Oliver Wendell Holmes, Jr., Aletta Jacobs, Alice Paul, Anna Howard Shaw, Baroness Bertha von Suttner, and Count Michael Karolyi.