American biologists Edgar Anderson and Berwind P. Kaufmann standing in a garden shelter. Anderson (1897-1969) was a botanist, whose book 'Introgressiv

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American biologists Edgar Anderson and Berwind P. Kaufmann standing in a garden shelter. Anderson (1897-1969) was a botanist, whose book 'Introgressive Hybridization' was an important contribution to botanical genetics. Kaufmann (1897-1975) was a botanist and geneticist who did pioneering work on the structure of chromosomes and chromosomal rearrangements induced by ionizing radiation. Photographed in 1941.

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Photo credit: © AMERICAN PHILOSOPHICAL SOCIETY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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