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German biologist and bacteriologist Ferdinand Cohn (1828-1898)

(Source: Portrait of Ferdinand Julius Cohn, vignetted head and shoulders, autographed Ferdinand Cohn. Bulletin of the Institute of History of Medicine, Johns Hopkins Press, Baltimore, Maryland, 1939;VII: Facing Page 49. Courtesy of the Wellcome Collection, London, England. Creative Commons Attribution 4.0 International License,

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