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$40National Geographic May 1, 2007
$40National Geographic Jul 1, 2007
$40National Geographic Dec 1, 2007
$40National Geographic Mar 1, 2008
$40National Geographic Jun 1, 2008
$40National Geographic Jul 1, 2008
$40National Geographic Aug 1, 2008
$40National Geographic Oct 1, 2008
$40National Geographic Dec 1, 2008
$40National Geographic Mar 1, 2009
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$40National Geographic Jun 1, 2009
$40National Geographic Nov 1, 2009
$40National Geographic Dec 1, 2009
$40National Geographic Feb 1, 2010
$40National Geographic Mar 1, 2010
$40National Geographic Jun 1, 2010
$40National Geographic Sep 1, 2010
$40National Geographic Dec 1, 2010
$40National Geographic Apr 1, 2011
$40National Geographic May 1, 2011
$40National Geographic Jun 1, 2011
$40National Geographic Mar 1, 2012
$40National Geographic May 1, 2012
$40National Geographic Jun 1, 2012
$40National Geographic Jul 1, 2012
$40National Geographic Feb 1, 2013
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$40National Geographic Nov 1, 2014
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$40National Geographic Oct 1, 2011
$40National Geographic Nov 1, 2011
$40National Geographic Nov 1, 1966
$50National Geographic Society and It's Jan 1, 1957
$111National Geographic May 1, 1962