Lenin: The Fifth (All-Russian) Conference of the R.S.D.L.P. https://www.marxists.org/archive/lenin/works/1908/5thconfr/index.htm
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Archive_rosa_luxemburg-karl_liebknecht http://ciml.250x.com/archive/luxemburg-liebknecht/english/karl_liebknecht_militarism_and_antimilitarism_english.html
Violation of the Prussian Constitution by Frederick Engels http://hiaw.org/defcon6/works/1846/05/15.html