TY  - BOOK
AU  - Hughes, Harold D.
AU  - Henson, Edwin R.
TI  - Crop production: principles and practices 
U1  - 631.5 22
PY  - 1957///
CY  - USA
PB  - The Macmillan Company
KW  - Statistics
KW  - Crop production
N1  - Includes index
ER  -