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References
- Glossary
- Encarta Online
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Library of Congress
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World Data Sources
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Internet Library
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NS Online
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Ask ERIC
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Site Reviews
- Research Tokyo
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National Research Council
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Coast Guard College
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Franklin Institute
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Science Links UK
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Natural History Museum
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Ontario Science Centre
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UNESCO Heritage
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Smithsonian
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Amazon Books
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Project Gutenberg
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Canadian Communities Atlas
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Statistics Canada
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