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en.wikipedia.org/wiki/Sixth_Principal_Meridian (5 Dec 2010)
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www.kansasphototour.com/meridian.htm (29 Jan 2003)
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www.ksls.com/about_surveys.htm (2 Oct 2010)
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www.pmproject.org/6pm.htm (23 Jan 2008)
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www.blm.gov/wo/st/en/prog/more/cadastralsurvey/meridians/6th_principal_meridian.print.html (2 Mar 2011)