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www.nhm.ac.uk/palaeontology/v&a/pea/pea.html
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www.zoo.cam.ac.uk/zoostaff/clack.htm
- Laurin, M. - The origin and phylogeny of tetrapods (Université Paris).
tolweb.org/tree/laurin/Laurin_Home_page.html
- Sues, H-D. - Triassic and Early Jurassic tetrapod paleobiology, University of Toronto.
www.zoo.utoronto.ca/sues
- Warren, A. - Early tetrapod paleontology (La Trobe Univ., Melbourne).
www.zoo.latrobe.edu.au/aaw
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