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Timber Growing and Logging Practice in the Douglas Fir Region

其他書名	Measures Necessary to Keep Forest Land Productive and to Produce Full Timber Crops
出版	U.S. Department of Agriculture, 1927
URL	http://books.google.com.hk/books?id=RmHMzgEACAAJ&hl=&source=gbs_api

註釋Of recommendations for handling forest lands. pp. 61.