Amazon.com description: Product Description: What is an Usborne Internet-linked book? It is a book that contains Usborne-reommended Web sites specially chosen to take you further into the subject in a fun and informative way. You can find links to all the recommended sites on the Usborne Quicklinks Web site at www.usborne-quicklinks.com. Will the Web sites go out of date? Web sites do change from time to time. The sites recommended in this book will be regularly reviewed and you will always be able to find up-to-date links to these or other suitable alternative sites at www.usborne-quicklinks.com. Free downloadable pictures. A selection of useful diagrams and pictures from this book are available for downloading, without charge, also from www.usborne-quicklinks.com. Must I be online to use this book? Absolutely not. This book works perfectly well as an outstanding conventional reference book without using the Internet at all. What else will I find in this book? Paperback. Pages: 48