Longley, Paul. text Chichester New York Wiley c2001 monographic xviii, 454 p. : ill. (some col.), maps (some col.) ; 26 cm. Geographic information systems Problem solving 910 WIL 2001 A099 Co. 0471495212 (alk. paper) 0471892750 (alk. paper) http://www.loc.gov/catdir/description/wiley034/2001017870.html http://www.loc.gov/catdir/toc/onix06/2001017870.html http://www.loc.gov/catdir/description/wiley034/2001017870.html http://www.loc.gov/catdir/toc/onix06/2001017870.html