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- Darwin, Erasmus, 1731-18024
- Davy, John, 1790-18681
- Delore, Xavier, 1828-1916, author1
- Drage, William, 1637?-1669, author1
- Draper, John C. (John Christopher), 1835-18851
- Du Bois-Reymond, Emil, 1818-1896, author1
- Duncan, Andrew, 1744-18281
- Dunglison, Robley, 1798-186922