"The authors' approach is wide ranging and multidisciplinary. The methodology is based on a deep understanding of the subject and exceptional in its scholarship. The authors' make many interesting links by drawing diverse data together to provide new ways of understanding rock art, the art of Southwest America/Mesoamerica, and how it relates to socio-cultural behavior." * Derek Hodgson "The authors present an interesting hypothesis (more a series of hypotheses) for the antiquity of Uto-Aztecan iconography based on possible, probable, and "if we accept" observations of rock art in the American West through central Mexico. They rely on a unique blend of linguistic analyses, archaeological data, and comparative similarities in iconography." * William D. Hyder, University of California Santa Cruz.