{"id":"000381554","type":"book","title":"Problems concerning the early Roman fortifications at Marktbreit (D) and Valkenburg ZH (NL)","pages":"489-496","container-title":"Limes, 18. Proceedings of the XVIIIth International Congress of Roman Frontier Studies held in Amman, Jordan, September 2000","author":[{"family":"Grane","given":"T."}]}