{"id":"001301971","type":"book","title":"Eine Grube mit drei Gräben - Befunde zur mittelalterlichen Stadtbefestigung von Vreden","pages":"82-85","container-title":"Archäologie in Westfalen-Lippe, 2009 (2010","author":[{"family":"Ellger","given":"Otfried"}],"issued":{"raw":"2010"}}