TY  - BOOK
AU  - Hughes,Harold D.
AU  - Henson, Edwin R. 
TI  - Crop production: principles and practices 
U1  - 633 
PY  - 1957///
CY  - New York
PB  - The Macmillan Com., 
KW  - Crop
KW  - Farming.
KW  - Agriculture
ER  -