Lenin: Inserts to V. Kalinin's Article 'The Peasant Congress' https://www.marxists.org/archive/lenin/works/1905/nov/16.htm
Letters: Marx To Colonel Engels Draft, Cologne, before 15 April 1849 https://marxistleninists.org/M&E/1849/letters/49_04_15.htm
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Lenin on Combining Revolutionary and Opportunist Elements Leading to Problems https://us.politsturm.com/lenin-on-combining-revolutionary-and-opportunist-elements-leading-to-problems
Letters: Marx To Caroline Schöler Paris, 14 July 1849 https://marxistleninists.org/M&E/1849/letters/49_07_14.htm
Economic Manuscripts: Capital Vol. I - Chapter Twenty-Five http://hiaw.org/defcon6/works/1867-c1/ch25.html