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1. Global 2G mobile coverage, 2011
2011. Collins Bartholomew Ltd. Representation of the area covered by GSM (2G) mobile communications around the world as of December 2011.
2. Global 3G mobile coverage, 2011
2011. Collins Bartholomew Ltd. Representation of the area covered by 3G mobile communications around the world as of December 2011.
3. Global 4G mobile coverage, 2011
2011. Collins Bartholomew Ltd. Representation of the area covered by 4G mobile communications around the world as of December 2011.
4. Global Population Database, 2011
2011. Oak Ridge National Laboratory, Bright, Edward A., Coleman, Philip R, and Rose, Amy N. LandScan 2011 Global Population Database is a raster theme representing population counts at 30 arc second resolution (1 km. or finer). Oak Ridge, TN.