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nebraskagravestones.org/cemetery.php?cemID=742 (21 Jul 2012)
Research your Nebraska ancestors and family history by searching our online database of Nebraska gravestone photos. Locate Nebraska gravestone images of your descendants and discover your Nebraska roots.
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www.usgennet.org/usa/ne/county/colfax/cemeteries/c_clarkson.html (19 Oct 2008)
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www.usgennet.org/usa/ne/county/colfax/cemeteries/c_clarksoni.html (25 Jun 2010)
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www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=1991491