TY  - GEN
AU  - Hughes,Harold D.
AU  -   
AU  - Henson,Edwin R.
TI  - Crop production: : principles and practices, handbook of information for the student of agriculture 
U1  - 633 
PY  - 1946///
CY  - New York
PB  - The Macmillan Company
KW  - Agriculture
KW  - Crops cultivation
KW  - Field crops
KW  - Rotation
KW  - Plant diseases
N1  - Includes bibliographical references and index
ER  -