• Abacci
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• Bill Thayer's Web Site
  
  10,000+ webpages, about 3500 large photos; mostly Roman history, architecture and archaeology; medieval churches, central Italy; American history.
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• AllRefer
  
  AllRefer.com provides articles in all areas of topics within Earth & Environment, History, Literature & Arts, Health & Medicine, People, Philosophy & Religion, Places, Plants & Animals, Science & Technology, Social Science, Law, Sports, Everyday Life, and more. Includes North America gazetteer and other reference works.
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