This plan was undertaken by the Arizona Department of Transportation Multimodal Planning Division Aeronautics Group to evaluate and recommend a terminal area layout to meet anticipated terminal area demands.

Black and white print of five women and one man riding mules on the Bright Angel Trail. A wooden sign next to the trail says, "Photo by Kolb Bros." Handwritten annotation, "Annie Goodenough on Bright Angel Trail."

Cooperative National Park Resources Studies Unit for University of Arizona, effects on Glen Canyon Dam releases on Grand Canyon River trips, a technical report, vol. no. 16.