Core refernce collections; documents, selections, online reference books in major subject areas at the World Book Online Reference Center.
World Book Online Reference Center
The premier online reference source--containing every article from the 22-volume print set plus thousands more. With state-of-the art multimedia, editor-reviewed Web sites, and more!
Primary and core source collections--books, documents, selections--in major subject areas.
Basic Spanish-language encyclopedia for elementary and middle grades.
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