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William Halvorson is a research ecologist with the with the U.S. Geological Survey’s Southwest Biological Science Center at the Sonoran Desert Research Station. He is also a faculty member at the School of Natural Resources and Environment at The University of Arizona.
William L. Halvorson (2 Titles)

To view any of this author's books, simply click the cover image or title below.

Science and Ecosystem Management in the National Parks
By William L. Halvorson; Gary E. Davis

Southwestern Desert Resources
Edited by William L. Halvorson; Charles van Riper; Cecil R. Schwalbe

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