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Some Chemical and Bacteriological Effects of Various Kinds and Amounts of Lime on Certain Southern Iowa Soils

Rudger Harper WalkerPercy Edgar BrownArthur Wesley Young

出版	Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts, 1932
URL	http://books.google.com.hk/books?id=uXUkAQAAMAAJ&hl=&source=gbs_api