1. School of Geography and Development; University of Arizona; Tucson Arizona USA
2. Laboratory of Tree-Ring Research; University of Arizona; Tucson Arizona USA
3. U.S. Geological Survey; Northern Rocky Mountain Science Center; Bozeman Montana USA
4. Department of Geography; University of Nevada, Reno; Reno Nevada USA
5. U.S. Geological Survey, National Research Program, Water Resources Division; Denver Federal Center; Denver Colorado USA