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Research funding was provided by NSF through the Arctic System Science Program (ARCSS) through the Russian-American Initiative on Shelf-Land Environments of the Arctic (grant OPP-9818496) and a Doctoral Dissertation Research Improvement Grant from the Geography Program (grant SRB-0425625). We thank our many colleagues from the United States, Russia, Canada, and Finland for helpful discussions on our results and assistance in compiling radiocarbon dates. We thank J. Flückiger for providing helpful comments on an earlier draft and for important comparative data.
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