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Walton, J. 1958(1957). XV. - On Protopitys (Göppert): with a Description of a Fertile Specimen Protopitys scotica sp. nov. From the Calciferous Sandstone Series of Dunbartonshire. Trans. Roy. Soc. Edinburgh 63 (2), Jan 1958 (sep. 25 Oct 1957): 333-340. ≡

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