Typescript and carbon copy of an incomplete and unpublished manuscript "Iz istorii osvoboditel'nogo dvizheniia (ili obshchestvennogo samosoznaniia) v Rossii. Pavel Borisovich Aksel'rod. Ego zhizn', literaturnaia i prakticheskaia deiatel'nost'" , 200 pp., attributed to Aptekman in a note signed by Abraham Ascher of Brooklyn College.