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Continually updated, The World Book Online Reference Center (WBORC) is a student's best source for accurate and accessible information. This comprehensive site includes all the articles from the 22-print volume print set, plus thousands more by World Book's renowned contributors and editorial staff.

The site includes:

• More than 40,000 encyclopedia and reference articles

• Thousands of links selected by World Book editors and expert contributors

• Historical features

• Extensive dictionary and atlas

• Correlations to state and provincial curriculum and achievement standards

• Audios, videos, and animations

• Educator tools

• Student activities

• A Spanish-language encyclopedia