TY  - BOOK
AU  - de, Rolf A
AU  - Knippers, Richard A
AU  - Weir, Michael J.C
ED  - International Institute for Aerospace Survey and Earth Sciences.
TI  - Principles of geographic information systems: an introductory textbook 
SN  - 90-6164-226-4 (pbk.)
AV  - G70.212 .P75 2004
U1  - 910/.285 21
PY  - 2004///
CY  - Enschede, The Netherlands
PB  - International Institute for Aerospace Survey and Earth Sciences.
KW  - Geographic information systems
N1  - Includes bibliographical references
ER  -