The Safford Valley gridsWilliam Emery Doolittle, James A. Neely, Karen R. Adams · First published 2004Open the Tome
Pre-Hispanic occupance in the valley of Sonora, MexicoWilliam Emery Doolittle · First published 1988Open the Tome
Pre-Hispanic occupance in the middle Río Sonora ValleyWilliam Emery Doolittle · First published 1985Open the Tome
