Produced partly by the modification of two images on Wikimedia Commons: File:USA Polk County, Iowa age pyramid.svg; File:USA Pocahontas County, Iowa age pyramid.svg. Both created originally by Commons User:WarXboT, Artur Jan Fijałkowski, who licenced them under the Creative Commons Attribution ShareAlike 2.5.
base data from US Census, base charts designed originally by Commons User:WarXboT, Artur Jan Fijałkowski, licensed under the Creative Commons Attribution ShareAlike 2.5.
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{{Information |Description = Chart comparing the age curves of [[Pocahontas County, Iowa]] and [[Johnson County, Iowa]] to demonstrate [[Rural flight]] |Source = Produced partly by the modification of two images on Wikimedia Commons: File:USA
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