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• The American Heritage Dictionary, American Heritage Spanish Dictionary, and Roget's II: The New Thesaurus are published by Houghton Mifflin and provided to us by Bartleby.com.
• The Columbia Encyclopedia is provided to us by Columbia University Press.
• Bartlett's Familiar Quotations, Gray's Anatomy of the Human Body, and The Oxford Shakespeare are provided to us by Bartleby.com.
• World Factbook was created by the CIA and provided to us by Bartleby.com.