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These files have been compiled by the Rare Book and Manuscript Library from its origin in 1930 through the present day. The material derives largely from gifts, and the occasional purchase; much of the subject file in particular is made of ephemera included in the American Type Founders, Co. Library, purchased in 1942. Prospectuses and information sent by fine presses and book artists are added to the relevant files in an ongoing fashion. The files cover subjects from the beginning of printing to the current day.

Letters from men outstanding in the scientific field, including Berzelius, Darwin, Faraday, Guericke, Helmholtz, Jenner, and Leibnitz. Some were presented to Dr. Herter by Henrietta Darwin Litchfield, daughter of Charles Darwin, and some by Paul Ehrlich to whome a number of the letters are addressed. Included in the collection is one page of the autograph manuscript of Darwin's ORIGIN OF SPECIES, authenticated by his daughter.

Correspondence, manuscripts, and documents of mathematicians and other scientists, often dealing with politics and fields other than mathematics. Many of these concern the French Revolution.