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Lexikon der christlichen Ikonographie : the most comprehensive source of information on Christian iconography : adding flexibility, user-friendliness, and multilinguality to Kirschbaum's reference work - [ Digital edition ]
[Leiden; Boston] : Brill, 2020
UB Heidelberg
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The index of medieval art
Princeton, NJ : Index of Christian Art, 1991-
UB Heidelberg , Bibliothek, Germanisches Nationalmuseum Nürnberg , Lizenzfreie Online-Ressourcen