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Friedrich Engels
Engels Friedrich 1820-1895
Friedrich Marx Karl and Engels
Friedrich MARX Karl & ENGELS
MARX, Karl & ENGELS, Friedrich
F. Engels K. Marx
Marx, Karl (with Friedrich Engels).

See also:

Engels, Friedrich
Engels Friedrich; Aveling Edward Bibbins
Engels, Frederick (Friedrich) plus N. Bucharin (Bukharin), E. Preobraschensky (Preobrazhensky)
Engels, Friedrich, and Aveling, Edward (Translated by), and author (special intro)