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Varker, William John (1964) The conodont faunas and stratigraphy of the Yoredale Series in the Askrigg and Alston regions. PhD thesis, University of Sheffield.
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Varker, William John (1964) The conodont faunas and stratigraphy of the Yoredale Series in the Askrigg and Alston regions. PhD thesis, University of Sheffield.