Park Williams, Lamont -Doherty Earth Observatory, Palisades, NY, United States, Edward R Cook, Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Connie A Woodhouse, University of Arizona, Tucson, AZ, United States, David M Meko, University of Arizona, Laboratory of Tree Ring Research, Tucson, AZ, United States, Benjamin Cook, NASA-GISS, New York, NY, United States, Kasey Bolles, Baylor University, Department of Geosciences, Waco, TX, United States and Scott Steinschneider, Cornell University, Ithaca, NY, United States