This award-winning book contains these essential features: ? More than 13,000 main entries, fully updated for the twenty-first century ? Hundreds of Word History, Language Detective, Vocabulary Builder, and Spelling notes ? More than 1,000 full-color photographs and drawings ? 26-page appendix including separate thesaurus, phonics and spelling, measurement, and geography sectionsThis award-winning book contains these essential features: ? More than 13,000 main entries, fully updated for the twenty-first century ? Hundreds of Word History, Language Detective, Vocabulary Builder, and Spelling notes ? More than 1,000 full-color photographs and drawings ? 26-page appendix including separate thesaurus, phonics and spelling, measurement, and geography sections