00313nam a2200109Ia 450000500170000000800410001708200150005810000180007324500610009126000430015230000080019520260224040900.0260224s9999||||xx |||||||||||||| ||und||  a338.13 BES  aBesong, M.T.  0aFarming systems research and extension in developing….  aNew Delhi: Serials Publications,c2009  a157