TY  - BOOK
AU  - Simmonds,N.W.
TI  - Principles of crop improvement
SN  - 0582446309
AV  - SB123 .S53
U1  - 631.5/3 
PY  - 1979///
CY  - London, New York
PB  - Longman
KW  - Plant breeding
N1  - Includes indexes; Bibliography: p. 369-399
ER  -