by Petr, F.C
Published in Corn Production Symposium; Proceedings (1975)

by Petr, F.C, Roylance, H.B
Published in Idaho Agr Coll Ext Bull (1969)

by Stewart V.R, Wesenberg D.M, Hayes R.M, Petr F.C
Published in Crop Science (1978)

by Jaynes C.C, Lindsey K.E, Lovelace D.A, Petr F.C, Supak J.R
Published in Research Monograph Texas Agricultural Experiment Station (1976)

by Hoffman, G.O, Elliott, F.C, Hodges, R.J, Metzer, R.B, Petr, F.C, Price, J.D, Spears, B.R, Supak, J.R, Palmer, R.D
Published in Tex Agr Exp Sta Mp (1973)