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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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.).
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.).
2010. U.S. Census Tracts represents the U.S. Census tracts of the United States in the 50 states, the District of Columbia, and Puerto Rico. Environmental Systems Research Institute (Redlands, Calif.).
2010. World Administrative Unit Boundaries represents the boundary lines for the first-level administrative units of the world. Environmental Systems Research Institute (Redlands, Calif.).
2010. World Administrative Units represents the boundaries for the first-level administrative units of the world. Environmental Systems Research Institute (Redlands, Calif.).
2010. World Continents represents the boundaries for the continents of the world. Environmental Systems Research Institute (Redlands, Calif.).
2010. World Country Boundaries represents the boundary lines for the countries of the world. Environmental Systems Research Institute (Redlands, Calif.).
2010. World Country Boundaries (Generalized) represents the generalized boundary lines for the countries of the world. Environmental Systems Research Institute (Redlands, Calif.).