1. Survey of geographic information systems for natural resources decision making at the local level;American Farmland Trust,1985
2. Concepts, objectives and structure of the Canada Soil Information System;Dumanski;Can. J. Soil Sci.,1975
3. Hardware roundup;Henkel;Computerworld,1985
4. Geographic information systems — a new frontier;Tomlinson,1984
5. The challenge of digital mapping and automated cartography;Zarzycki,1985