U.S. National Ocean Service, Geographical Center of the United States, U.S. Department of Commerce, National Oceanic and Atmospheric Administration,...
U.S. National Ocean Service. Geographical Center of the United States. U.S. Department of Commerce, National Oceanic and Atmospheric Administration,...
U.S. General Services Administration, National Archives and Records Service. Code of Federal Regulations. Title 14, Aeronautics and space....
U.S. Census Bureau, Geography Division . Centers of Population for the United States 1950 - 2010 Washington, D.C. : U.S. Department of Commerce,...
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Australian Government, Geoscience Australia. Centre of Australia, States and Territories. Accedido en http://www.ga.gov.au el 8 de mayo de...
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