Temperature records gleaned from clamshells reveal accuracy of Norse sagas.
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Patterson, W. P., Dietrich, K. A., Holmden, C. & Andrews, J. T. Proc. Natl Acad. Sci. USA doi: 10.1073/pnas.0902522107 (2010).
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Lovett, R. Shellfish could supplant tree-ring climate data. Nature (2010). https://doi.org/10.1038/news.2010.110