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Annual Report - Vermont. Agricultural Experiment Station, Burlington
Vermont Agricultural Experiment Station
出版Free Press Printing Company, 1916
URLhttp://books.google.com.hk/books?id=G31RAQAAMAAJ&hl=&source=gbs_api
註釋"Condensed outlines of articles published in Reports 1-19, Bulletins 1-133, 1887-1907, [by Joseph L. Hills], "in no. 20 p. 387-505.