This exhibit has been made possible with support from Northern Arizona University, the Bureau of Land Management, the National Park Service, and the U.S. Geological Survey.

Map and camera stations by J. Luke Blair and Todd Welch.

Repeat Photography by Robert Webb, Don Oldershaw, Diane Boyer, and Tom Hanks.

The repeat photography Web site was constructed by NAU Digital Access Librarian Todd Welch and Luke Blair, with additional technical assistance from Dave Botts.