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Annual Report

University of Minnesota. Agricultural Experiment Station

出版	The Station., 1898
URL	http://books.google.com.hk/books?id=2pU_AQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

9th, 17th-20th reports include bulletins no. 69-72, 110-128.