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Introduction to Geographic Information Systems , 4/e
Student Edition
ArcView 3.2 Data S...
ArcGis 8.1 Data Sets
For ArcGIS 9.2 Users
For ArcGIS 9.3 Users

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Spatial Data Editing

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Land Management Information Center at Minnesota Planning: NSSDA statistic

( http://www.lmic.state.mn.us/ )
Laser-Scan: Radius Topology

( http://www.laser-scan.com/technologies/radius/radius_topology/ )
Ordnance Survey: Master Map

( http://www.ordnancesurvey.co.uk/oswebsite/ )