The path of the U.S. center of population, 1790-2000.
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The path of the U.S. center of population, 1790-2000.
The path of the U.S. center of population, 1790-2000. ⓒU.S. Census 2005.06.30
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The path of the U.S. center of population, 1790-2000.
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