Head of the Historical Division of the Carnegie Institution, the archaeologist Alfred V. Kidder specialized in the cliff dwelling cultures of the American Southwest, and is best remembered for work at Pueblo Bonito, Chaco Canyon, and Pecos del Arroyo. Primarily personal in nature, the exchange of letters between Kidder and his colleague and friend Neil M. Judd provides some details on their work on the archaeology of the Southwest. The 68 letters include sporadic references to excavations at Pueblo Bonito, Chaco Canyon, and other archaeological sites, with a few references to other archaeologists and anthropologists.