Books by H. Hotz:
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Hotz, H., ed.: The Moral and Intellectual Diversity of Races, With Particular Reference to Their Respective Influence in the Civil and Political History of Mankind (with an appendix by Nott on "the question of unity or plurality of species" of humans; Philadelphia: J. B. Lippincott and Co., 1856), by Arthur Gobineau, contrib. by Josiah C. Nott
Find more by H. Hotz at your library, or elsewhere.