By Lenné J.M.   Ward A.F.   in Outlook on Agriculture

ISSN:0030-7270|39|1|31-40

IP Publishing Ltd‎(2010)‎

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By Lenné J.M.   Pink D.A.C.   Spence N.J.   Ward A.F.   Njuki J.   Ota M.   in Outlook on Agriculture

ISSN:0030-7270|34|4|225-232

IP Publishing Ltd‎(2005)‎

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