- http://www.enchantedlearning.com/subjects/sharks/anatomy/Teeth.shtml
- http://bric.postech.ac.kr/science/97now/03_2now/030220a.html
- http://www.boneroom.com/fossils/vertfossils.html
- http://paleoenterprises.com/moreinfo.htm
- http://www.mgs.md.gov/esic/brochures/sharks.html
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