TY  - BOOK
AU  - Mackenzie, David R.
TI  - Results of the fourth international spring wheat yield nursery, 1967-68
U1  - 633.11 M17R 
PY  - 1971///
CY  - Mexico, U.S.
PB  - Int. Maize & Wheat Improvement Control
KW  - WHEAT
ER  -