TY  - BOOK
AU  - Martin, John Holmes
AU  - Leonard, Warren H.
TI  -  	Principles of Field Crop production
AV  - SB 187 .U6M3 1967 
PY  - 1967///
CY  -  	New York :  
PB  -  Macmillan
KW  - Field crops -- United States
ER  -