Fundamentals of geographic information systems / DeMers, Michael N. Geographic information systems 910 JOH 2009 A118 Or. Text xiii, 443 pages : http://www.loc.gov/catdir/enhancements/fy0814/2007038332-b.html http://www.loc.gov/catdir/enhancements/fy0814/2007038332-d.html http://www.loc.gov/catdir/enhancements/fy0814/2007038332-t.html