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Good Places to Start (more in other tabs)
- ESRI Data & Maps Layers covering the USA, international areas, and the entire world (Duke Only)
- ArcGIS Open Data Over 25,000 free GIS datasets primarily from U.S. federal, state, and local agencies, but some international areas, too.
Data for History
- GeoCommons Various GIS layers and geospatial data uploaded by anyone. Hit-or-miss, but you might find anything.