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Oxford Art Online  Excellent articles on the history of the art and architecture of regions and countries (Rome, Ancient), cities and sites (Rome), materials and techniques (Marble), individual artists, patrons (Augustus, Emperor), buildings (Forum Augustum), and other monuments (Ara Pacis). Each article is supplemented by a bibliography of major primary and secondary sources and often includes links to good quality online s.illustrations. Be sure to consult the List of Abbreviations for titles cited in the bibliographies