http://microstationtoday.com/microstation-tip-corner-survey-foot-versus-international-foot-whats-the-difference/

http://www.oregon.gov/ODOT/HWY/GEOMETRONICS/docs/Footvs.Feet.pdf

http://vterrain.org/Projections/sp_feet.html

http://gis.pima.gov/data/about/units.htm

Posted on Friday, January 13, 2012 in Article of the Week by Howard Ehmke | Add Comment

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