1991. U.S. Census Bureau. and GeoLytics, Inc. District boundaries for the 102nd United States Congress, Jan. 3, 1991 to Jan. 3, 1993. Harvard Geospatial Library.
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2007. This polygon shapefile is a representation of the coverage area for 2G mobile communications networks around the world in 2007. The data is created... Collins Bartholomew Ltd.
2007. This polygon shapefile is a representation of the coverage area for 3G mobile communications networks around the world in 2007. The data is created... Collins Bartholomew Ltd.
2008. This polygon shapefile is a representation of the coverage area for 2G mobile communications networks around the world in 2008. The data is created... Collins Bartholomew Ltd.
2008. This polygon shapefile is a representation of the coverage area for 3G mobile communications networks around the world in 2008. The data is created... Collins Bartholomew Ltd.
2008. World Countries represents the boundaries for the countries of the world as they existed in January 2008. Environmental Systems Research Institute (Redlands, Calif.).
2008. World Countries (Generalized) represents generalized boundaries for the countries of the world as they existed in January 2008. Environmental Systems Research Institute (Redlands, Calif.).
2009. This polygon shapefile is a representation of the coverage area for 2G mobile communications networks around the world in 2009. The data is created... Collins Bartholomew Ltd.
2009. This polygon shapefile is a representation of the coverage area for 3G mobile communications networks around the world in 2009. The data is created... Collins Bartholomew Ltd.
2010. U.S. and Canada City Areas represents the city limits of cities in the United States and Canada. This data set provides six feature classes for dis... Environmental Systems Research Institute (Redlands, Calif.).