TY  - BK
AU  - Johnson,M.W.
AU  - Brown,R.P.
AU  - Korman,G.N.
AU  - Naismith,R.W.
TI  - 1969 Pennsylvania corn performance studies
T2  - Progress Report - Agricultural Experiment Station (USA).
PY  - 1970///
PB  - The Pennsylvania State University, 
ER  -