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"Middle Telychian (Llandovery, Silurian) graptolites and biostratigraphy of the Howgill Fells, England, based upon the collections of D.W.R. Wilson housed in the Lapworth Museum of Geology, University of Birmingham." Proceedings of the Yorkshire Geological
Society
63.1
(2020):
33-42.
Web. 27 Feb. 2021.