Geografiese inligtingstelsel: Verskil tussen weergawes
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Opruim Etiket: 2017-bronwysiging |
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<ref name ="goodchild">{{cite journal|doi=10.5311/JOSIS.2010.1.2|title=Twenty years of progress: GIScience in 2010|year=2010|last1=Goodchild|first1=Michael F|journal=Journal of Spatial Information Science|issue=1}}</ref>
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