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Google圖書搜尋
Field Experiments in Spraying Apple Orchards in 1916
Harrison August Ruehe
Alfred Joseph Gunderson
Charles Elmer Durst
Cyril George Hopkins
Ernest McChesney Clark
Stephen Alfred Forbes
William Sanford Brock
出版
University of Illinois Agricultural Experiment Station
, 1916
URL
http://books.google.com.hk/books?id=K5JOAQAAMAAJ&hl=&source=gbs_api