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- EbookLes bases de la morale évolutionnisteHerbert Spencer
- EbookJohn Stuart Mill; His Life and Works Twelve Sketches by Herbert Spencer, Henry Fawcett, Frederic Harrison, and Other Distinguished AuthorsH. R. Fox (Henry Richard Fox) Bourne
- EbookThe Factors of Organic EvolutionHerbert Spencer
- EbookLes bases de la morale évolutionnisteHerbert Spencer
- EbookIllustrations of Universal ProgressHerbert Spencer
- EbookThe Philosophy of StyleHerbert Spencer