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The sleet breaks occur on old burns where the area has been again seeded to timber, mostly red fir, [[underlined]] very closely [[/underlined]]. The trees may be 100 or even 200 feet high after [[insertion]] ^ 10, [[/insertion]] 15 or 20 years. Areas of many acres, being very close, very slender, and very tall, after becoming weighted with snow and sleet in winter, begin to lean and finally with additional snow the whole mass goes down gradually. Make no loud noise. Common all about. Only on slopes, and always fall down hill, trees all killed