That is, each page may have zero or more child pages , but only one parent page. From a given page, you can move to its parent or to any of its children. The children of the page are also listed at the top and sides of the current page. An outline of the tree is provided on the table of contents page. A link to the table of contents is provided at the bottom of every page.
Many pages contain cross-links to pages in other branches of the tree.
You can also search the site by keyword . A link to the search page is provided on every page on the site. If all else fails, you can e-mail the author or the editor . Links are included at the bottom of every page. Contact the author .