Page 57, Footnote 36: Deleted duplicate "to". Originally: Personal correspondence to to L. D. Mech, Oct. 10, 1969.
Page 58: Changed "diffference" to "difference". Originally: Nevertheless, with extremely deep snow, the diffference
Page 59, Literature Cited: Changed "roll" to "role". Originally: Nasimovich, A. A. 1955. The roll of the regime of snow
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