TY  - GEN
AU  - Singh
TI  - STAINABLE AGRICULTURE: ISSUES,PERSPECTIVES AND PROSPECTS IN SEMI ARID TROPICS
U1  - 630.28/ISA 
PY  - 1990///
CY  - NEW DELHI
PB  - Indian Society of Agronomy
N2  - Indian Society of Agronomy
ER  -