The worldwide catalogue number assigned to each new book by its publisher. ISBNs assist librarians, distributors, wholesalers and booksellers in identifying, ordering, and maintaining inventory control over new titles. A publisher will be issued ISBNs according to the number of titles in print, to be assigned to each existing title, and to every future title. The master list of current ISBN titles is "Books in Print", which is available in bookstores and libraries. To obtain information and ISBN applications for new books, contact: Library of Congress, Washington, DC 20540-4160; http://lcweb.loc.gov/isbn/; 202/707-3000. See LCN, UPC, Dewey decimal system, book categorization, out of print.