{"id":"000997360","type":"book","title":"Masons' marks in castles: a key to building practices","publisher":"Centre de Recherche Archéologique Médiévales","publisher-place":"Caen","pages":"23-27","container-title":"Château Gaillard. 18. Études de castellologie médiévale. Actes du Colloque International tenu à Gilleleje (Danemark), 24-30 août 1996","author":[{"family":"Butler","given":"Lawrence"}],"issued":{"raw":"1998"}}