Julio L. Betancourt

Julio L. Betancourt is a geoscientist with the National Research Program, Water Mission Area, U.S. Geological Survey, and an adjunct professor at the University of Arizona.
Packrat Middens Packrat Middens
Packrat Middens

Packrat Middens

The Last 40,000 Years of Biotic Change

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Requiem for the Santa Cruz Requiem for the Santa Cruz
Requiem for the Santa Cruz

Requiem for the Santa Cruz

An Environmental History of an Arizona River

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