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Published online by Cambridge University Press: 16 December 2008
1. The author notes the existence of another biography: Mare Waldenburg, Wzlot i upadek Kautsky' ego (The Rise and Fall of Karl Kautsky), as yet untranslated from Polish.
2. Karl Kautsky, “Offener Brief an die Zentralleitung der Unabhängigen Sozialdemo-kratischen Partei Deutschlands,” Kautsky Archive, International Institute for Social History, Amsterdam.