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Estimating Production Rates and Operating Costs of Timber Harvesting Equipment in the Northern Rockies

其他書名	1981-1982
出版	U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, 1981
URL	http://books.google.com.hk/books?id=s0pLbxWpqAsC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN