TY  - BOOK
AU  - N. W. Simmonds
TI  - Principles of crop improvement
SN  - 0-582-40737-0
U1  - 581.56 
PY  - 1979///
CY  - London
PB  - English Language book Society
KW  - Breeding
N1  - N. W. Simmonds: Principles of crop improvement.  London.  English Language book Society, 1979. 0-582-40737-0--(581.56SIM)
ER  -