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BurgruineFreiburgZaehringen. Engraving showing the ruins of the original castle of the Dukes of Zaehringen in Freiburg around Source Heinrich Schreiber Freiburg Br mit seinen Umgebungen Herder Aufl Date Author Manfredjohannes PDold Burg Zhringen Freiburg im Breisgau History of Freiburg im Breisgau Engravings of castles in BadenWrttemberg