TY  - BOOK
AU  - Simmonds, N. W.
TI  - Principles of crop improvement
SN  - 0582407370
U1  - 631.53 
PY  - 1979///
CY  - London
PB  - Longman
KW  - Plant breeding
N1  - Includes bibliographical references (p.369-399) and index
ER  -