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ZitadelleCyriaksburg Verstrkungsplan. de Plan zur Verstrkung der Zitadelle Cyriaksburg whrend des Umbaus zwischen und gelangte aber nicht zur Ausfhrung Landesarchiv Magdeburg century Author PDold Zitadelle Cyriaksburg Erfurt map Maps of Erfurt Maps of fortifications Erfurt in the th century
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