http://digfir-published.macmillanusa.com/data_connections_bergerls10e/chapter_14_eldersandchildren_bergerls10e.html
Chapter
14. Elders and Children as a Proportion of a Nationâs Population
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http://digfir-published.macmillanusa.com/data_connections_bergerls10e/chapter_14_eldersandchildren_bergerls10e_dlap.xmlDLAP questions5b8fbc9c7894d2a423000003