TY  - BOOK
AU  - National Symposium on Approach.............Calcutta, May 19-
TI  - Higher productivity in agriculture
U1  - 631.5 N28H 
PY  - 1980///
CY  - New Delhi
PB  - Oxford & IBH
KW  - CROP YIELDS
KW  - AGRICULTURE -- ECONOMIC ASPECTS
ER  -