Lenin: 272. TO THE EDITOR OF BREMER BÜRGER-ZEITUNG https://www.marxists.org/archive/lenin/works/1913/jan/00bbz.htm
Letters: Marx-Engels Correspondence 1863 https://marxistleninists.org/M&E/1863/letters/63_04_21-abs.htm
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Lenin Archive English http://ciml.250x.com/archive/lenin/english/lenin_1923_16_january_our_revolution.html