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Plastic Tubing for Collecting Maple Sap
Barton M. Blum
其他書名
A Comparison of Suspended Vented and Unvented Installations
出版Northeastern Forest Experiment Station, Forest Service, U.S. Department of Agriculture, 1967
URLhttp://books.google.com.hk/books?id=KK-pKUjYteQC&hl=&source=gbs_api
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註釋S2The objective of this study was to compare sap yields from the two methods of tubing installation and to investigate the factors involved in any observed differences in yield.S3.