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242: Engels to Adolf Hepner
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written by Friedrich Engels, 1820-1895 (1872); in Karl Marx, Federick Engels: Collected Works, vol. 44, Marx and Engels: 1870-73 (New York, NY: International Publishers, New York, NY, 1989), 442-442
written by Friedrich Engels, 1820-1895 (1872); in Karl Marx, Federick Engels: Collected Works, vol. 44, Marx and Engels: 1870-73 (New York, NY: International Publishers, New York, NY, 1989), 442-442
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written by Herbert Spencer, 1820-1903; in The Works of Herbert Spencer, Vol. 20: An Autobiography, Vol. I (Osnabruck, Lower Saxony, 1966), 437-445
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written by Herbert Spencer, 1820-1903; in The Works of Herbert Spencer, Vol. 21: An Autobiography, Vol. 2 (Osnabruck, Lower Saxony, 1966), 204-227
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