00298nam a2200109Ia 450000500170000000800410001708200160005810000200007424500410009426000450013530000080018020260224040950.0260224s9999||||xx |||||||||||||| ||und||  a631.522 CHO  aChopra, V .L.   0aPlant breeding : theory and practice  aNew Delhi: Oxford & IBH Publishersc1989  a471