1. Laboratory of Tree-Ring Research; University of Arizona; Tucson Arizona USA
2. School of Natural Resources and the Environment; University of Arizona; Tucson Arizona USA
3. Dendroclimatology Group; Swiss Federal Research Institute WSL; Birmensdorf Switzerland
4. W. Szafer Institute of Botany; Polish Academy of Sciences; Krakow Poland
5. Stable Isotope Ratio Facility for Environmental Research, Department of Biology; University of Utah; Salt Lake City Utah USA
6. Department of Ecology and Evolutionary Biology; University of Arizona; Tucson Arizona USA