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106. World - Continents

126. Stata Journal Volume 10, Number 4 - 2010

132. World - World Roads

135. World - Gazetteer

145. World - Time Zones

152. World - World Airports

171. World - Cities

177. Stata Journal Volume 10, Number 2 - 2010

186. World - Lakes

188. Stata Journal Volume 10, Number 1 - 2010

189. World - Regions