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5. World - Continents

12. World - World Airports

24. Stata Journal Volume 10, Number 4 - 2010

36. World - World Contours

51. Stata Journal Volume 10, Number 3 - 2010

62. Stata Journal Volume 11, Number 1 - 2011

68. World - UTM Zones

80. Stata Journal Volume 11, Number 2 - 2011

89. World - Rivers