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Melvil Dewey, the creator of the famed Dewey Decimal System which classifies mostly non-fiction library books and resources, was born on December 10, 1851, in New York and this date has been adopted to celebrate and honor him annually for Dewey Decimal System Day. Dewey created his proprietary system of library resource classification while working at the Amherst College library at the age of 21. The Dewey Decimal System was first published in 1876 and is now the most widely used system around the world in over 200,000 libraries in 135 countries. The 20th edition of the system had been published by the late 20th century.