Der Briefwechsel zwischen Friedrich Engels und Karl Marx 1844 bis 1883, Erster Band

The collection presents an extended intellectual partnership and political collaboration across decades, tracing the evolution of socialist theory and engagement with workers' movements. The letters mix discussion of publications, research, and tactical decisions with candid exchanges about finances, personal hardships, friendships, and rivalries. Editorial apparatus describes selection choices, occasional redactions, translations of foreign phrases, and orthographic standardization, while annotations and registers assist orientation. Altogether the correspondence shows how mutual critique, practical support, and continuous cooperation shaped major writings and public interventions, combining political argument with intimate practical detail.