00363nam a2200121Ia 4500008004100000082002000041100001900061245004100080260004700121300001400168600001800182650004100200140224s9999    xx            000 0 und d  a633:631(213) L5  aWilliams, C.N.  aAgronomy of the major tropical crops  aKualaLumpurbOxford University Pressc1975  axix,228p.  aC.N. Williams  aAgriculture,Tropical crops-varieties