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World Book Online has the following 12 products that you can use for free:
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Kids - content and tools for young students
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Student - thousands of articles for elementary/middle school students
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Advanced - powerful reference tool for high school students
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Dramatic Learning - readings of plays
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Academic - resource for researchers at the university level
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Discover - differentiated instruction for individuals reading below grade level and ELLs
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Enciclopedia Estudiantil Hallazgos - excellent editorial content, rich media, and interactive features in Spanish
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Hispanica Saber Gran Enciclopedia Hispanica - comprehensive Spanish-language encyclopedia
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Early World of Learning - resouces to help preschoolers and primary grade students - stories, nursery rhymes, songs
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Early Peoples - information on all ancient civilizations
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Inventions & Discoveries - reference materials in many disciplines including medicine, architecture and engineering to name a few
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Living Green - contains articles on alternative energies, pollution, food production and more