TY  - BOOK
AU  - HOFMANN-WELLENHOF B
TI  - GPS:  Theory and practice   
SN  - 9788181287519
U1  - Y9(X991), P1 
PY  - 2001///
CY  - New York
PB  - Springer         
KW  - Geography
N1  - Bibliography: P 182-187
ER  -