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Digital Spatial Data - HSU Library
California
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Cheap Discount U.S. 5-Digit ZIP Code Tabulation Area (ZCTA5) ArcGIS Shapefile Download
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A transition from ArcGIS to open source GIS softwares - Appropedia: The sustainability wiki
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As if anyone cares...: OpenSource GIS Software
- 1. read and edit shapefiles, 2. provide thematic representations - mainly choropleth but other styles are bonus.
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arcgis - How to build effective heat-maps? - GIS - Stack Exchange