1. Laboratory of Tree Ring Research University of Arizona Tucson AZ USA
2. Department of Geospatial Science Radford University Radford VA USA
3. Department of Geography and Earth and Environmental Systems Institute The Pennsylvania State University University Park PA USA
4. Department of Meteorology and Atmospheric Science and Earth and Environmental Systems Institute The Pennsylvania State University University Park PA USA
5. Department of Agricultural and Food Sciences (DISTAL) University of Bologna Bologna Italy
6. School of Natural Resources and the Environment University of Arizona Tucson AZ USA
7. Department of Geography University of Vermont Burlington VT USA