TY  - BK
AU  - Borlaug,N.E.
TI  - How should breeding systems be revised so as to develop varieties with maximum grain yields
PY  - 1968///
PB  - Hard Red Winter, 11th and Hard Red Spring, 11th Joint Wheat Workers Conference, Kansas State University, 
KW  - High-yielding varieties
KW  - AGROVOC
KW  - Wheat
ER  -