TY  - BOOK
AU  - NAG P
AU  -  SENGUPTA S
TI  - Geographical information system:  Concepts and business opportunities   
SN  - 8180694356
U1  - U:(D6,9(B), P7 
PY  - 2007///
CY  -  New Delhi 
PB  - Concept Publications        
KW  - Geography
N1  - Bibliography: P 463-510
ER  -