00299nam a2200097Ia 4500008004100000082002200041100002900063245005000092260005200142300000700194140113s9999    xx            000 0 und d  a63.002.2(047)  L4  aUniversity of California  aA Hungry world : The challenge to agriculture  a1974bUniversity of California c"C.A., U.S.A."  a68