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Hans Poelzig : Architektur 1869 - 1936
Berlin-Kreuzberg : Vice Versa Verlag, [1993] ; © 1993
SLUB Dresden , UB Heidelberg , Sächsische Bibliografie
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Simbologie cristalline. Le radici romantiche dell'Espressionismo
BASE - Bielefeld Academic Search Engine , ART-Dok (Virtual Library for Art, Heidelberg University)