TY  - BOOK
AU  - Paul W. Heisey
TI  - Accelerating the transfer of wheat breeding gains to farmers : A study of the dynamics of varietal replacement in Pakistan
SN  - 968-6127-40-2
U1  - 633.1109549 
PY  - 1990///
CY  - Mexico
PB  - CIMMYT
ER  -