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. 2020 Jun 22;117(27):15443–15449. doi: 10.1073/pnas.2002722117

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Fig. 1. — Location map. Shown are drilling sites for the six Arctic ice core records evaluated in this study (pluses), the Okmok and Mount Etna volcanoes, tree (6, 11) and Shihua Cave (12) speleothem-based climate proxy records, and the extent of the Roman provinces and Ptolemaic Kingdom in 44 BCE.