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Vetusta Monumenta : Ancient Monuments, a Digital Edition
University of Missouri
Datenbank-Infosystem (DBIS)
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Catalogo Manuscritti / Biblioteca Apostolica Vaticana
Datenbank-Infosystem (DBIS)
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Art and Archaeology Artifact Browser
Tufts University
Datenbank-Infosystem (DBIS)
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JSTOR
Datenbank-Infosystem (DBIS)