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CHAPTER 26 Pisces In The Fossil Record. HARLAND, W.B. et al. (Eds.) 1967, London (Geological Society), pp: 627-683
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Freshwater stingrays from the Plio-Pleistocene of the Turkana Basin, Kenya and Ethiopia. Lethaia, 26(4), 359–366
DOI: 10.1111/j.1502-3931.1993.tb01542.x