00281nam a2200109Ia 450000500170000000800410001708200120005810000100007024500380008026000450011830000080016320260224040946.0260224s9999||||xx |||||||||||||| ||und||  a630 CAB  aCABI  0aPerspectives in world agriculture  aLondon: Commonwealth Agri  Bureauxc1980  a532