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Albert Bierstadt: Rocky Mountains - Lander's Peak
ART-Dok (Virtual Library for Art, Heidelberg University), 1999
BASE - Bielefeld Academic Search Engine , ART-Dok (Virtual Library for Art, Heidelberg University)
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Albert E. Henselmann (1890-1974) : Der Weg zur Form?
ART-Dok (Virtual Library for Art, Heidelberg University), 2002
BASE - Bielefeld Academic Search Engine , ART-Dok (Virtual Library for Art, Heidelberg University)