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1. Stata Journal Volume 11, Number 1 - 2011

2. Stata Journal Volume 11, Number 2 - 2011

4. Stata Journal Volume 11, Number 3 - 2011

5. Stata Journal Volume 11, Number 4 - 2011

16. World - Continents

25. World - World Airports

42. Stata Journal Volume 10, Number 4 - 2010