共 9 条
[1]
DICKE FF, 1955, CORN CORN IMPROVEMEN, P537
[2]
FITZGERALD PJ, 1964, 19 P ANN HYBR CORN I, V19, P46
[3]
KIESSELBACH TA, 1949, 161 NEBR AGR EXP STA
[4]
MELHUS IRVING E., 1954, IOWA STATE COLL JOUR SCI, V29, P75
[5]
Ortman, 1965, P NO CENT BRANCH ENT, V20, P46
[6]
ORTMAN EE, 1964, 19 P ANN HYBR CORN I
[7]
ORTMAN EE, 1964, P NO CENT BRANCH ENT, V19, P92
[8]
SPRAGUE GF, 1955, CORN CORN IMPROVE ED, P537
[9]
WILLIAMS CG, 1915, 282 OH AGR EXP STA B