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Johanna Spyri , Helene White S. .
T. Y. Crowell, 1913
Heredity and Eugenics: A Course of Lectures Summarizing Recent Advances in Knowledge in Variation, Heredity, and Evolution, and Its Relation to Plant, Animal, and Human Improvement and Welfare
William Ernest Castle, John Merle Coulter, Charles Benedict Davenport, Edward Murray East, William Lawrence Tower.
University of Chicago Press, 1912