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| number of days without permanent snow cover (As the number of days without permanent snow cover increased, the proportion of white weasels dropped precipitously – by Ben Guarino, The Washington Post Tamerlane) | |||
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| number of days without permanent snow cover (As the number of days without permanent snow cover increased, the proportion of white weasels dropped precipitously – by Ben Guarino, The Washington Post Tamerlane) | |||