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Die Kunstdenkmäler der Schweiz. Zur Geschichte eines Erfolgsunternehmens
BASE - Bielefeld Academic Search Engine , ART-Dok (Virtual Library for Art, Heidelberg University)
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Cracow: an illustrated history
Hippocrene Books Inc., 2001
BASE - Bielefeld Academic Search Engine , ART-Dok (Virtual Library for Art, Heidelberg University)
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Warschau (Berühmte Kunststätten ; 66)
Seemann, 1918
BASE - Bielefeld Academic Search Engine , ART-Dok (Virtual Library for Art, Heidelberg University)