TY  - BOOK
AU  - Simmonds, N.W.
TI  - Principles of crop improvement/by N.W.  Simmonds 
SN  - 0582407028
U1  - 631.53  
PY  - 1981///
CY  - Essex
PB  - ELBS
KW  -  Agriculture and Related Technologies
KW  - Technology (Applied Sciences)
KW  - Crop Improvement
ER  -