The International Polar Year (IPY) has covered two full annual cycles at both poles. Consisting of 170 projects, it has involved more than 60 countries and cost about US$1.2 billion.
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International Polar Year: Notes from the poles. Nature 457, 1074–1075 (2009). https://doi.org/10.1038/4571074a
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DOI: https://doi.org/10.1038/4571074a
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