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Chicago-viite (17. p.)ebrary, Inc, P. A. Burrough, ja Ian Masser. European Geographic Information Infrastructures: Opportunities and Pitfalls. London ; Bristol, PA: Taylor & Francis, 1998.
MLA-viite (9. p.)ebrary, Inc, et al. European Geographic Information Infrastructures: Opportunities and Pitfalls. Taylor & Francis, 1998.
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