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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:828145
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www.rootsweb.ancestry.com/~nebutler/circlemound/circmdcem.html
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www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=100487
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butlercountygallery.com/drupal/cem_detail/CMC (2 Mar 2013)
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butlercountygallery.com/drupal/sites/default/files/CMC.pdf (20 May 2010)