Among the legal notices, marketing spiel, and publisher contact information typically found on a book’s copyright page, you will also find sets of numbers that may seem arbitrary to the untrained eye. But these numbers actually have a clear purpose and can help people and entities locate your book online. Groups of numbers, such as 978-1-7324999-0-4 and 2017949317, listed on a book’s copyright page are not arbitrary at all; in fact, they make up a large part of your book’s m