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Essex Institute, Salem, Mass., U.S.A. 



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Geologists' Association, London. 



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Do. Supplemental Number, Opening Address, Session 



1873-74. 



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Geological Report on Londonderry and parts of Tyrone and Fer- 

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Liverpool Geological Society. 



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Liverpool Naturalists' Field Club. 

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Manchester Field Naturalists' Society. 

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