1. U.S. Geological Survey; 520 North Park Ave., Suite 221 Tucson AZ 85719
2. Dep. of Hydrology and Water Resources; J.W. Harshbarger 122, 1133 East North Campus Drive, P.O. Box 210011, Univ. of Arizona Tucson AZ 85721
3. U.S. Geological Survey; 5735 Kearny Villa Road San Diego CA 92123