{"id":"001024729","type":"book","title":"Problems concerning the early Roman fortification at Marktbreit (D) and Valkenburg ZH (NL)","publisher":"Archaeopress","publisher-place":"Oxford","pages":"489-496","container-title":"Limes 18 : Proceedings of the 18th International Congress of Roman Frontier Studies held in Amman, Jordan (September 2000","author":[{"family":"Grane","given":"Thomas."}],"issued":{"raw":"2002"}}