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Google圖書搜尋
Tractive Efficiency of the Farm Tractor
Jay Brownlee Davidson
Eugene George McKibben
Edgar Vermont Collins
出版
Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
, 1935
URL
http://books.google.com.hk/books?id=HnUkAQAAMAAJ&hl=&source=gbs_api