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Number of days the Alaska Department of Natural Resources (ADNR) permitted winter tundra travel on the North Slope of Alaska. The year on the x‐axis denotes the spring season, with many seasons in the earlier part of the record opening in October or November of the preceding year, and many in the later part of the record opening in January of the year. Data are from a handout prepared by the ADNR Division of Mining, Land, & Water, Northern Regional Office, updated June 2018.
