While working as a librarian at Amherst College, Melvil Dewey developed a system of book classification using numbers from 000-999, dividing nonfiction books into 10 broad categories. By the time of his death, the system was being used in over 96% of all American libraries. Dewey helped found the American Library Association and is credited with creating the world's first library science curriculum.
Dewey also founded the Spelling Reform Association and preferred to spell his name Melvil Dui.
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