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The ESRI research plan, 1976-80 and background analysis
- "The ESRI Research Plan, 1976-80 and background analysis"
- "The ESRI research plan, 1976-80 and background analysis"@en
- "The ESRI research plan, 1976-80 and background analysis"
- "The ESRI research plan, 1976-80, and background analysis"