R. R. Bowker LLC (trading as Bowker) is an American limited liability company domiciled under Delaware Limited Liability Company Law and based in Chatham, New Jersey. Among other things, Bowker provides bibliographic information on published works to the book trade, including publishers, booksellers, libraries, and individuals; its roots in the industry trace back to 1868. Bowker is the exclusive U.S. agent for issuing International Standard Book Numbers (ISBNs). Bowker is the publisher of Books in Print and other compilations of information about books and periodical titles. It provides supply chain services and analytical tools to the book publishing industry. Bowker is headquartered in Chatham, New Jersey, with additional operational offices in England and Australia. It is now owned by Cambridge Information Group. Source: Wikipedia (en)