TY  - BOOK
AU  - Simmonds, N. W.
TI  - Principles of crop improvement
SN  - 0582455863
U1  - 631.5SIM 21
PY  - 1979///
CY  - London
PB  - Longman
KW  - Plant breeding
KW  - Crop improvement
KW  - Plants
ER  -