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Felleman, J.: Symposium on geographic information systems : [Themenheft] (1990)
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GIS in academic libraries (1995)
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Geographic information systems (GISs) revisited : a symposium (1997)
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Newell, R.: Geographic information systems : where are we? and where do we go from here? (1994)
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Raper, J.: Geographic relevance (2007)
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