TY  - BOOK
AU  - Martin,John H.
AU  - Leonard,Warren H.
TI  - Principles of field crop production
AV  - SB187 M37
PY  - 1949///
CY  - New York
PB  - Macmillan Co.
KW  - Field crops
KW  - United States
N1  - "References" at end of each chapter
ER  -