World Book updates its content more thoroughly and often than any other encyclopedia. Most multi-volume reference books revise 5 percent of their total pages. Each year, World Book revises more than a quarter of its entire content. This comprehensive adjustment covers: Topics, Vocabulary, Grade level, Interest level, Writing style, Maps, Photographs and Charts and graphs.

World Book articles are comprehensive and give readers a solid foundation about a subject, and are a vital resource for any student, or children. World Book encyclopedias contain numerous pictures and diagrams, as well as comprehensive - yet easy to follow - information on each of the thousands of topics.

World Book's commitment to providing accurate, lively and content-rich articles has culminated in the publication of the number-one selling print encyclopedia in the world, World Book, and market leading electronic products such as World Book Multimedia Encyclopedia and World Book Online. Recent World Book publications include World Book Student Discovery Encyclopedia, a new Childcraft-The How and Why Library, and Animals of the World.

At World Book website you can discover the whole range of World Book publications, from activity books and CD/DVD products to encyclopedias, general reference books, science books, history reference books, Spanish language encyclopedias and other Spanish language reference books, plus lots more besides. For affordable, quality reference books and encyclopedia, World Book website is the only stop you'll ever need!