TY  - BOOK
AU  - Martin John H
AU  -  Leonard Warren H
AU  -  Stamp David L
TI  - Principles of field crop production
U1  - J3:3, L6 
PY  - 1976///
CY  - New York    
PB  -  Macmillan Pub.       
KW  -  Food
KW  - Agriculture
ER  -