Lenin: The Agrarian Question and the 'Critics of Marx' https://www.marxists.org/archive/lenin/works/1907/agrarcom/index.htm
Letters: Letters from the Deutsch-Französische Jahrbücher by Karl Marx http://hiaw.org/defcon6/works/1843/letters/43_09.html
February Revolution 1917 - Comintern Archive revolutionary events of history http://ciml.250x.com/archive/events/english/1917_februaryrevolution/february_revolution_1917.html