TY  - BOOK
AU  - John H. Martin
AU  -  Warren H. Leonard, 
TI  - Principles of field crop production. Ed 2
U1  - 633 
PY  - 1967///
CY  - New York
PB  - The Macmillan Company
N1  - John H. Martin & Warren H. Leonard: Principles of field crop production. Ed 2.  (2nd Ed)  New York.  The Macmillan Company, 1967.--(633MAR)
ER  -