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Armstrong, John D. Synonymy of the australian permian spiriferid genera Trigonotreta Koenig, 1825 and Grantonia Brown, 1953. by J.D.Armstrong. In Journal of the Geological Society of Australia, Adelaide, 1968, vol.15, Pt.1. Adelaide : Geological Society, 1968, Journal of the Geological Society of Australia, Adelaide, 1968, vol.15, Pt.1.S.79-86, : .
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