Geographic information systems : appropriate tools for productive planningCampbell, Jack L.GIS-Baltic Sea States '93 : exhibition, conference, Tallinn, Estonia, 29 November - 1 December : proceedings1994 / p. 23-32: ill

Geographic information systems: appropriate tools for productive planningCampbell, Jack L.GIS-Baltic Sea States '93 : exhibition, conference, Tallinn, Estonia, 29 November - 1 December 1993 : abstract book, catalogue1993 / p. 14