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2. Topological Principles of Cartography;Corbett,1979
3. An Examination of Selected, Major Cartographic and Census Geographic Systems;SPAD Systems Ltd.,1982
4. An Examination of Selected, Turnkey Geographic Information Systems;SPAD Systems Ltd.,1982
5. Raster Scanning, Plotting and Processing of Cartographic Documents for the Bureau of the Census;SPAD Systems Ltd.,1982