TY  - BOOK
AU  - Martin,John H.
AU  - Leonard,Warren H.
TI  - Principles of field crop production
AV  - SB187.U6 M3 1967
U1  - 633 
PY  - 1964///
CY  - New York
PB  - Macmillan
KW  - Field crops
KW  - United States
N1  - Includes bibliographies and indexes
ER  -