Encyclopedia Britannica (English and Spanish versions)
Great background knowledge written by authorities in each field.
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Science Reference Center (Ebsco)
Science Reference Center contains full text for hundreds of science encyclopedias, reference books, periodicals, and other sources. (Applied Sciences, Earth Sciences, Life Sciences, Physical Sciences, Scientists, and Space Sciences & Astronomy)
http://search.ebscohost.com
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ImageQuest
Thousands of royalty-free images, all subject areas. Citations included in downloads.
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