TY  - BOOK
AU  - Davis ,E. Bruce
TI  - Geographical information systems: A visual approach 
SN  - 1566900980
AV  - G70.212  .D38  1996 
PY  - 1996///
CY  - Toronto
PB  - Onword press
KW  - Information
N1  - Includes index
ER  -