TY  - BOOK
AU  - Roberrts, William 
AU  - Singh, S B S Kartar
TI  - Text book of Punjab agriculture 
PY  - 1947///
CY  - Lahore: 
PB  - Civil and Military Gazette Ltd, 
KW  - Agriculture
KW  - Crop
KW  - Physiology of plants
ER  -