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Anviwònman University of Leeds UK elèv yo sèlman Bilgari Paleontology Disparisyon Toarcian PhD Ewòp Early Jurassic Lès Tethys Jeochimik Ewopeyen an Fevriye 2013 Latè
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Environment University of Leeds UK students only Bulgaria Palaeontology Extinction Toarcian PhD Europe Early Jurassic Eastern Tethys Geochemistry European February 2013 Earth