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Socialism and positive science (Darwin-Spencer-Marx)
Catalogue of the printed books and manuscripts in the library of the New College, Edinburgh
Tropical Africa
Chapters in popular natural history
Across Africa
Through Gasa land, and the scene of the Portuguese aggression. The journey of a hunter in search of gold and ivory
My study windows
Catalogue of the Library of the Academy of Natural Sciences of Philadelphia
An introduction to the study of social evolution, the prehistoric period