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http://elibrary.asabe.org/azdez.asp?JID=3&AID=2449[...]07/09/2013
http://elibrary.asabe.org/azdez.asp?JID=3&AID=2449[...]07/09/2013PDF Reader
http://naldc.nal.usda.gov/download/17604/PDF07/09/2013PDF Reader