1. K. M. Cuffey, Department of Geological Sciences, Box 351310, University of Washington, Seattle, WA 98195, USA.
2. G. D. Clow, U.S. Geological Survey, Mail Stop 975, Menlo Park, CA 94025, USA.
3. R. B. Alley, Earth System Science Center and Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, USA.
4. M. Stuiver, Quaternary Isotope Laboratory and Department of Geosciences, Box 351310, University of Washington, Seattle, WA 98195, USA.
5. E. D. Waddington, Geophysics Program, Box 351650, University of Washington, Seattle, WA 98195, USA.
6. R. W. Saltus, U.S. Geological Survey, Mail Stop 964, Denver Federal Center, Denver, CO 80225, USA.