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Skyline Yarding Cost Estimating Guide

Ronald W. MifflinHilton H. Lysons

出版	Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1978
URL	http://books.google.com.hk/books?id=XP22nSRXacEC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN