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2. Tree Trunks Preserved in Lava;Battey;Amer. J. Sci.,1951
3. The Interbasaltic Rocks of North-East Ireland;Cole;Mem. geol. Surv. U.K.,1912
4. On the Occurrence of Gyrolite in County Antrim;Fleischmann;Miner. Mag.,1909
5. Tree Trunks Preserved in a Volcanic Flow in the Northern Cameroons;Hyde;Amer. J. Sci.,1951