Dr. Silvertooth will not be teaching PLS 306 for fall 2012. Thank you. Alicia Alicia M. Velasquez Graduate Program Coordinator Notary Public Soil, Water and Environmental Science University of Arizona Shantz Bldg., Room 429, PO Box 210038 1177 E. Fourth Street Tucson, AZ 85721 520-621-1606 avelasqu at ag.arizona.edu