TY  - BOOK
AU  - Delorit, Richard J.
TI  - Crop production; principles and practices
U1  - 633.002 J3 
PY  - 1953///
CY  - New York
PB  - Prentice-Hall
KW  - Ahlgren, Henry L.
KW  - Field crops,Cropping systems,Crop production
ER  -