Geological & palaeontological map of the British Islands. By A.K. Johnston, F.R.G.S. From the sketches & notes of Professor Edward Forbes, F.R.S. of Kings College London & of the Government School of Mines, President of the Geological Society. Engraved by W. & A.K. Johnston. William Blackwood & Sons, Edinburgh & London. 1st March 1854, (1856) https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~24691~940030

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