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Understanding proboscidean evolution: a formidable task Je-heskel Shoshani(1998)
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International Commission on Stratigraphy charts(2019)
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Advances in Elephant Phylogony(2004)
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A proboscidean from the late Oligocene of Eritrea, a ‘‘missing link’’ between early Elephantiformes and Elephantimorpha, and biogeographic implications (2006)
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The latest woolly mammoths (2002)
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The evolution of elephants, by Jan van der Made (2010)
