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Richey, J.E. (1939). ‘The Dykes of Scotland’, offprint of the Transactions of the Edinburgh Geological Society, v.13,. Edinburgh Geological Society.
Lister, JJ. (1891). ‘[Geological Map of] the Tonga or Friendly Islands’ in ‘Notes on the Geology of the Tonga Islands’, extract. Geological Society of London.
![Lister, JJ. (1891). ‘[Geological Map of] the Tonga or Friendly Islands’ in ‘Notes on the Geology of the Tonga Islands’, extract](http://geolmaps.com/cdn/shop/products/Extracts1_38_TongaIslands_{width}x.jpg?v=1681660747)
![Lister, JJ. (1891). ‘[Geological Map of] the Tonga or Friendly Islands’ in ‘Notes on the Geology of the Tonga Islands’, extract](http://geolmaps.com/cdn/shop/products/Extracts1_38_TongaIslands_580x.jpg?v=1681660747)