A.C. MacWilliams No description specified. 1-3 (3 Records) Documents Recent Test Excavations at an Early Agricultural Period Cerro de Trincheras Site on the Upper Gila River, Arizona (2015) The San Rafael de la Zanja Land Grant River Corridor Survey, Volume I (2001) The San Rafael de la Zanja Land Grant River Corridor Survey, Volume II: Site Maps (2001)