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Effects of Nitrogen and Shearing Treatments on Growth and Quality of Douglas-fir Christmas Trees in Western Washington

Alex G. OggDarrell O. TurnerDonald R. SatterlundGeorge F. RyanRoland SchirmanW. W. HeinemannDavid W. PriceDonald Alan WestJ. R. Powers

出版	Washington State University, College of Agriculture Research Center, 1979
URL	http://books.google.com.hk/books?id=u8JQAQAAMAAJ&hl=&source=gbs_api