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Relation of Site Factors to Stand Density of Scotch Pine After Attack by Pine Spittle Bug and Tip Blight in Stinchfield Woods

其他書名	This Thesis is Submitted in Partial Fulfillment ... for the Degree of Master of Forestry ...
出版	University of Michigan, 1956
URL	http://books.google.com.hk/books?id=-9jhn00A8dMC&hl=&source=gbs_api