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II.—Note on the Occurrence of Trigonograptus ensiformis, Hall, sp., and of a Variety of Didymograptus v-fractus, Salter, in the Skiddaw Slates
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- Journal:
- Geological Magazine / Volume 7 / Issue 8 / August 1890
- Published online by Cambridge University Press:
- 01 May 2009, pp. 340-344
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