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Survey of Ten Nutrient Elements in Pennsylvania Forage Crops
David Grammer White
Emerson Macaulay Babb
Harold Kenneth Fleming
John Clifford Frey
Kathleen A. Johnston
Pennsylvania State University. Agricultural Experiment Station
Raymond Walter Swift
Ward M. Sharp
其他書名
Red clover. I.
出版
Pennsylvania State University, College of Agriculture, Agricultural Experiment Station
, 1957
URL
http://books.google.com.hk/books?id=27rEAQAACAAJ&hl=&source=gbs_api
