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6. Duke University GIS Layers

8. Stata Journal Volume 9, Number 4 - 2009

9. Stata Journal Volume 9, Number 1 - 2009

10. Stata Journal Volume 9, Number 2 - 2009

11. Stata Journal Volume 9, Number 3 - 2009

12. The Stata Journal

16. Durham GIS Features - Political Boundaries / Voting

17. Durham GIS Features - Transportation

20. U.S. Census Population Estimates - County Level