Documents concerning the December 1908 congress of the groups abroad, held in Basel, Switzerland. Correspondence between CBZG and Zagraničnoe Bjuro Central'nogo Komiteta (ZBCK) (Заграничное бюро Центрального комитета РСДРП); correspondence between members of the CBZG; other correspondence of the CBZG, including correspondence with editorial boards of papers; letterbooks 1908-1914; some minutes, correspondence with the CBZG, rules, resolutions, reports, and other documents of local groups in Austria, Belgium, Bulgaria, Czechoslovakia, Denmark, Finland, France, Germany, Great Britain, Greece, Italy, Norway, Latvia, Poland, Sweden, Switzerland, Ukraine, Argentina, Canada, and the USA; administrative, financial and other documents of the CBZG, including notebooks of G.V. Čičerin (Чичерин Георгий Васильевич).