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5. A letter of George H. Shull to Wilhelm Ludwig Johannsen, 1908 (In the Library of the American Philosophical Society). Mendel Newsl; 1972 Oct; no. 8():5. PubMed ID: 11615529 [No Abstract] [Full Text] [Related]
6. Reasoning in scientific change: Charles Darwin, Hugo de Vries, and the discovery of segregation. Darden L Stud Hist Philos Sci; 1976; 7(2):127-69. PubMed ID: 11615593 [No Abstract] [Full Text] [Related]
7. Hugo De Vries and Thomas Hunt Morgan: the mutation theory and the spirit of Darwinism. Bowler PJ Ann Sci; 1978 Jan; 35(1):53-73. PubMed ID: 11615685 [No Abstract] [Full Text] [Related]