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Armstrong, John D. Microstructure of the shell of a permian spiriferid brachiopod. by J.D.Armstrong. In Journal of the Geological Society of Australia, Adelaide, 1968, vol.15, Pt.2. Adelaide : Geological Society, 1968, Journal of the Geological Society of Australia, Adelaide, 1968, vol.15, Pt.2.S.183-188, : .
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