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Book publishers represent less than a sixth of the publishers in the United States. Most books are published by a small number of very large book publishers, but thousands of smaller book publishers exist. Many small- and medium-sized book publishers specialize in a specific area. Additionally, thousands of authors have created their own publishing companies, and self-published their own works.

Within the book publishing industry, the "publisher of record" for a book is the entity in whose name the book's ISBN is registered. The publisher of record may or may not be the actual publisher.