TY  - BOOK
AU  - Chapman, Stephen R.
AU  - Carter, Lark P.,
TI  -  Crop production: principles and practices 
SN  - 0716705818
U1  - 633 CHA 
PY  - 1976///
CY  - San Francisco
PB  - W. H. Freeman
KW  - Field crops
KW  - North America
N1  - Includes bibliographies and index
ER  -