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We thank the many scientists, engineers, technicians and graduate students from the Byrd Polar Research Center and the Lanzhou Institute of Glaciology and Geocryology (China). Special thanks are extended to B. Koci, lead ice core driller; and to V. Mikhalenko, B. Barber, and W. Tamayo Alegre for field assistance. This work was supported by NSF's Office of Climate Dynamics and the Division of Polar Programs (grants ATM-8519794, ATM-89116635, and DPP-9014931), the National Geographic Society (grants 3323-86, 4309-90, and 4522-91), Ohio State University, and the State Committee of Science and Technology and the National Natural Science Foundation of China. This is contribution 1051 of the Byrd Polar Research Center.
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