O'Brien, L.E., Coleman, A., Blank, B.L., Grams, P.E., and Schmidt, J.C., 2000, Testing the application of digital photogrammetry to monitor topographic changes of sandbars in the Colorado river ecosystem: Final Report to the Grand Canyon Monitring and Research Center, Flagstaff, AZ, 32 p.

Pederson, J.L., Petersen, P.A., Macfarlane, W.W., Gonzales, F.M., and Kohl, K., 2003, Mitigation, Monitoring, and Geomorphology Related to Gully Erosion of Archaeological Sites in Grand Canyon. Prepared for the Grand Canyon Monitoring and Research Center.