Melvil Dewey was one of the most influential librarians of his day and is still one of the most recognized names in librarianship.
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Since the DDC system was created more than 135 years ago, it's easy to assume that the Dewey name is in the public domain. However, it never has been, and since 1988, OCLC Online Computer Library Center has held the trademark on the Dewey name.
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