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Because of the federal government shutdown, the U.S. National Science Foundation Ice Core Facility (NSF-ICF) is currently closed.

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This material is based upon work supported by the U.S.National Science Foundation through an Interagency Agreement (NSF-2041950) to the U.S. Geological Survey. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U.S. National Science Foundation or the U.S. Geological Survey.