TY  - BOOK
AU  - S.V. Govinda Rajan
AU  -  H.G. Gopala Rao, 
TI  - Soil and crop productivity : A handbook for the use of workers in agricultural extecnsion, vocational agriculture and farmers in
SN  - 0-210-27100-0
U1  - 631.4 
PY  - 1971///
CY  - New York
PB  - Asia Publishing House
ER  -