Encyclopedias

World Book Encyclopedia
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Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs. Requires free temporary registration with option to buy continued access for full articles.

The Probert Encyclopaedia
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Reference source with several hypertext linked entries covering a broad variety of subjects.

Information Please
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Online dictionary, Columbia Encyclopedia, and almanac reference.