TY  - GEN
AU  - Silva, Ranjith Premalal De 
TI  - Global positioning systems : theory,application & practice
SN  - 9558928011
U1  - 001.42 
PY  - 2004///
CY  - Sri Lanka
PB  - Geo- Informatics Society of Sri Lanka
KW  - Research methods
KW  - Knowleadge
KW  - Research
ER  -