TY  - BOOK
AU  - Simmonds,N.W.
TI  - Principles of crop improvement
SN  - 0582407370
PY  - 1979///
CY  - Harlow
PB  - Longman Group Ltd
KW  - Crops
KW  - Cropping systems
N1  - Includes index and bibliography; Open access
ER  -