By The American Phytopathological Society, Saint Paul, Minnesota, U.S.A..
Links for Martinus Beijerinck (1851–1931):
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http://www.apsnet.org/publications/apsnetfeatures/Pages/MartinusWillemBeijerinck.aspx
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By The Encyclopaedia Britannica, Inc.
https://www.britannica.com/biography/Martinus-W-Beijerinck -
By Wikipedia, the free encyclopedia.
https://en.wikipedia.org/wiki/Martinus_Beijerinck
