Библиогр: p. 455-468%Index 531-556
| УДК |
Аннотация: The marked development, during during the past decde, in power logging machinery and methods has made it desirable to revise the first edition. A chapter has also been added on the use of crawler tractors in logging work because theirb rapid adaptation to the logger's needs indicates the extensive adoption of this form of equipment. This chapter hs been prepared by A. Koroleff, a Russina forest engineer, who has spent much time in studying the use of this kind of equipment on logging operations in the United States. The subject matter has been rearranged, in part, to better meet the needs of the teacher and student and much of the text has been rewritten
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