http://en.wikipedia.org/wiki/Bone_tool (http://en.wikipedia.org/wiki/Bone_tool)
http://www.uiowa.edu/~osa/learn/ancient/bone.htm (http://www.uiowa.edu/~osa/learn/ancient/bone.htm)
http://www.sdsmt.edu/wwwsarc/collectn/bone.html (http://www.sdsmt.edu/wwwsarc/collectn/bone.html)
http://www.sciencedaily.com/releases/2008/10/081021214301.htm (http://www.sciencedaily.com/releases/2008/10/081021214301.htm)
http://murphylibrary.uwlax.edu/digital/jur/2002/richter-dettloff.pdf (http://murphylibrary.uwlax.edu/digital/jur/2002/richter-dettloff.pdf)
http://www.nysm.nysed.gov/IroquoisVillage/constructionthree.html (http://www.nysm.nysed.gov/IroquoisVillage/constructionthree.html)
http://users.stlcc.edu/mfuller/renner/Bone.html (http://users.stlcc.edu/mfuller/renner/Bone.html)