LIBROS DEL AUTOR: a staaf

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  • Tree Harvesting Techniques
    A. Staaf / N. a. Wiksten
    The introduction of chain saws and tractors in the early 1950’s marked the beginning of a change in tree harvesting techniques from the old manual methods to mechanized operations. It was followed by a rapid evolution both technically and systematically. Hence, the requirements for improved know­ ledge of operational efficiency also increased. Changin...
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