Archaeology of the Grand Canyon: The Bright Angel Siteby Douglas W. Schwartz; Michael P. Marshall; Jane Kepp;Archaeology of the Grand Canyon: Unkar Deltaby Douglas W. Schwartz; Richard C. Chapman; Jane Kepp;Archaeology of the Grand Canyon: The Walhalla Plateauby Douglas W. Schwartz; Jane Kepp; Richard C. Chapman;The Archaeology of Powell Plateau: Regional Interaction at Grand Canyonby Richard W. Effland; A. Trinkle Jones; Robert C. Euler