TY  - GEN
AU  - Hayes, Herbert Kendall
AU  - Immer, Forrest Rhinehart
AU  - Smith, David Clyde
TI  - Methods of plant breeding
U1  - 631.53 HAY 
CY  - New York, Mc Graw- Hill Book Company Inc
KW  - Plant breeding- Methods/ Heterosis
ER  -