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A public librarian for over 40 years, John Cotton Dana began his career in 1889 as head of the Denver Public Library, moved to the City Library of Springfield in 1898, and ended his career at the Free Public Library in Newark, New Jersey.An early leader in the library profession, he served as president of the American Library Association (ALA) from 1895 to 1896, as a member of its council from 1896 to 1902, and as president of the Special Libraries Association from 1909 to 1910, an organization he helped to establish.

A literary award presented annually since 1974 by the Reference and User Services Association (RUSA), a division of the American Library Association (ALA), to the most outstanding reference work published during the preceding calendar year.By exposing the plate to light in a , a laterally reversed latent image was captured in the photosensitive layer of silver iodide that could be developed with the application of mercury vapor.Made public in 1839, the process was named after its French inventor, the painter of dioramas, Louis Jacques Mande Daguerre, who relied heavily on earlier experiments by Joseph Nicephore Niepce. Morse (of Morse code) in Paris in 1839, who subsequently taught it to paying students in the United States.When it appears before a personal name in the English language, the dagger indicates that the individual is deceased.Also called an Historically, the first photographic process that actually worked, producing a positive image directly on a highly polished, silvered copper plate sensitized with iodide vapor.

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