I was looking through this book, copyrighted 1973, at my folks' house the other day, and noted from the photographs that very few of the loggers in those days were using Humboldts, except in Oregon. The WA, BC, ID, and AK sections all showed predominately conventional face cuts. Today, of course, nearly every pro uses the Humboldt almost exclusively. Does anybody know how this practice spread and when? The why is obvious enough; I just don't have any idea of the time line.
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