Marx-Engels Correspondence 1870
Source: Karl Marx, Letters to Dr Kugelmann (Martin Lawrence, London, undated). Scanned and prepared for the Marxist Internet Archive by Paul Flewers.
The Address  enclosed.
My time is so taken up with ‘International’ work that I do not get to bed before three in the morning. This to excuse my obstinate silence.
Best greetings to Madame la Comtesse and Fränzchen.
1. The Second Address of the General Council of the First International on the Franco-Prussian War, dated 9 September 1870 – Marx-Engels-Lenin Institute.