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Google圖書搜尋
Missing Hills in Potato Fields
Fred Carlton Stewart
Mancel Thornton Munn
Robert Stanley Breed
Fred Elmer Gladwin
Frederick Zeller Hartzell
Harold Edward Hodgkiss
U. P. Hedrick
Whitman Howard Jordan
其他書名
Their Effect Upon the Yield
出版
New York Agricultural Experiment Station
, 1918
URL
http://books.google.com.hk/books?id=tMtQAQAAMAAJ&hl=&source=gbs_api