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BISAT, W. S. 1957. Upper Viséan goniatites from the Manifold valley, North Staffordshire. Palaeontology, 1, 1, 16–21.
W. S. BisatGoniatites warslowensis sp. nov. and Pronorites ludfordi sp. nov. are described from the Bollandian (P1C Zone) of North Staffordshire.
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