author: tucson richard stephen felger executive director drylands institute

The Trees of Sonora, Mexico

Tucson Richard Stephen Felger Executive Director Drylands Institute AZ University of Arizona Matthew Brian Johnson Program Manager and Curator Desert Legume Program Tucson Michael Francis Wilson Research Director Drylands Institute AZ

Science

... Royal Botanic Garden , Kew , UK . Critchfield , W. B. and E. L. Little , Jr. 1966. Geographic distribution of the pines of the world . USDA Forest Service Miscellaneous Publication 991. Government Printing Office , Washington , D.C. ...