TY  - TH
AU  - Ortiz Ferrara,G.
TI  - A comparison of four methods of selection for the improvement of grain yield in winter by spring wheat crosses (Triticum aestivum L. em Thell)
PY  - 1980///
CY  - Corvallis, OR (USA)
PB  - Oregon State University, 
N1  - Nationality: MX; Thesis (Ph. D.)
ER  -