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Hermann Helmer Litho. en Hermann Helmer Architect Lithograph by Adolf Dauthage from Knstler Album published by Eckstein Vienna de Hermann Helmer Architekt Lithographie von Adolf Dauthage aus Knstler Album herausgegeben von Eckstein Wien um Eigenes Foto einer Originallithographie der NB Wien Adolf Dauthage Foto Peter Geymayer