Description: Map of the number of freezing days [per year] in North America, 1898. "The number of freezing days in a year increases northwardly over the shaded portion of the chart, the first line showing where there are thirty days of freezing weather, the second line sixty days, and so on." —Redway, 1898.
Source: Jacques W. Redway and Russell Hinman, Natural Advanced Geography (New York, NY: American Book Company , 1898) 54
Map Credit: Courtesy the private collection of Roy Winkelman. |
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