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en.wikipedia.org/wiki/Fifth_Principal_Meridian (11 Feb 2011)
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www.pmproject.org/5pm.htm (23 Jan 2008)
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webportal.american-abstract.com/surveys.htm (11 Oct 2006)
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www.blm.gov/wo/st/en/prog/more/cadastralsurvey/meridians/5th_principal_meridian.print.html (19 Feb 2011)
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www.blm.gov/wo/st/en/prog/more/cadastralsurvey/meridians/n_s_dakota_minn__iowa.html (19 Feb 2011)