Author
Geological Survey (U.S.)
5 results
Powell, Brian F.
University of Arizona. School of Renewable Natural Resources
4 results
Halvorson, William L. (William Lee), 1943-
3 results
Schmidt, Cecilia A.
3 results
Sonoran Desert Field Station (Tucson, Ariz.)
3 results
United States. National Park Service
3 results
University of Arizona. School of Natural Resources
1 results