The Book module is one of the most useful of all Drupal modules due to its ability to add a high level of structure and organization to the content on your site. Its main function is to maintain a hierarchy of content and to offer a means of ordered navigation between them. These are the familiar previous, next, and up links that you can see at Drupal.org in the handbook (for example, at http://drupal.org/node/22963). Furthermore, the Book module has a content type of its own, called book pages.
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