{"id":"000252712","type":"book","title":"The defences of the Roman forts at Bu Ngem and Gheriat el-Garbia","publisher-place":"Oxford","pages":"63-82","container-title":"Portae cum turribus. Studies of Roman fort gates. [Papers of a seminar at South Shields in July 1985","author":[{"family":"Welsby","given":"D."}],"issued":{"raw":"1989"}}