Browsing Desert Plants, Volume 12, Number 1 (June 1996) by Authors
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A Tale of Two Species: Speculation on the Introduction of Pachycereus pringlei in the Sierra Libre, Sonora, Mexico by Homo sapiensYetman, David A.; Búrquez, Alberto; Center for Southwest Studies, The University of Arizona; Centro de Ecología, Northwest Regional Station, National Autonomous University of Mexico (University of Arizona (Tucson, AZ), 1996-06)