Correspondence and other documents received and dispatched in his capacity as secretary of the International Socialist Committee in Berne, from and to Pavel Aksel'rod, S. Bronstein Semkovskij, Angelica Balabanoff, Camille Huysmans, Lenin, Willi Münzenberg, Christian Racovsky, Karl Radek, Henriette Roland Holst, Bertha Thalheimer, Leon Trotsky, David Wijnkoop, Clara Zetkin, G.E. Zinov'ev and others and the boards of various socialist parties and other organizations 1914-1918; circulars issued by R. Grimm and the International Socialist Committee 1915-1916; minutes and drafts of minutes of the Zimmerwald Conference and the preparatory session with mostly handwritten annexes 1915; handwritten minutes of the February and May session of the comprehensive committee 1916; minutes of the Kienthal Conference with mostly handwritten annexes 1916; declarations and resolutions issued by various socialist parties and other organizations 1914-1919; handwritten manifestos, reports and notes concerning the international socialist movement 1914-1917; press clippings, leaflets and pamphlets 1914-1917; manuscript of his translation of Charles Rappoport's Jean Jaurès biography n.d. Supplement (not arranged): correspondence (originals and photocopies) 1914-1918, financial documents 1915-1918 and documentation.