TY  - BOOK
AU  - Williams, Watkin.
TI  - Genetical principles and plant breeding
T2  - Botanical monographs
AV  - QK981 .W53
U1  - 581.15 
PY  - 1964///
CY  - Oxford
PB  - Blackwell Scientific Pub.
KW  - Crops
KW  - Genetics
KW  - Plant breeding
N1  - Includes index; Includes bibliography
ER  -