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2. Digital Cartographic Data Standards Task Force, 1988, “The Proposed Standard for Digital Cartographic Data” The American Cartographer, 15(1), p. 140.
3. International Standards Organization, 1985, Information Processing: Specification for a Data Descriptive File for Information Interchange, ISO 8211.
4. “Fundamental Concepts that Form the Basis of the Proposed American cartographic Data Exchange Standard;Moellering;Cartography,1988
5. “Digital Cartographic Data Standards: The U.S. Experience”;Morrison;Cartography,1988