Though it was officially published weeks later in two volumes, Carl Linnaeus's "Species Plantarum" was given the day of issue of May 1, 1753.
This Day in History Class
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Abraham Ortelius publishes the first world atlas - May 22nd, 1570
Leopold and Loeb murder Bobby Franks - May 21st, 1924
President Lincoln signs the Homestead Act - May 20th, 1862