1. Select a subject title from the list to go directly to the individual subjects of the Digital Library.
2. Search all content of the Digital Library in a single search, or use the Advanced Search link for Boolean, date, and phrase search.
3. Additional online content, including interactive features, lesson plans, Web sites, and videos and animations, is available from the homepage, search results, and section pages.
4. Icons for all of the World Book sites in your subscription appear at the bottom of every page on the site, for consistent and clear navigation between sites on the World Book Web.