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Art Resource
Art Resource Inc.
Datenbank-Infosystem (DBIS)
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Census of Antique Works of Art and Architecture Known in the Renaissance
Humboldt-Universität zu Berlin; Berlin-Brandenburgische Akademie der Wissenschaften
Datenbank-Infosystem (DBIS)
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Art Index
Datenbank-Infosystem (DBIS)
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Art and Archaeology Artifact Browser
Tufts University
Datenbank-Infosystem (DBIS)