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Underwood, Charlie J. (2004) Barremian and Aptian (Cretaceous) sharks and rays from Speeton, Yorkshire, north-east England. Proceedings of the Yorkshire Geological Society 55 (2), pp. 107-118. ISSN 0044-0604.
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Underwood, Charlie J. (2004) Barremian and Aptian (Cretaceous) sharks and rays from Speeton, Yorkshire, north-east England. Proceedings of the Yorkshire Geological Society 55 (2), pp. 107-118. ISSN 0044-0604.