TY  - BOOK
AU  - Peuquet,Donna J.
AU  - Marble ,Duane. F
TI  - Introductory readings in Geographic Information systems
SN  - 0850668573
U1  - 910.285 
PY  - 1993///
CY  - London
PB  - Taylor & Francis
KW  - Principal components
KW  - The Tiger system
ER  -