A first edition copy of one of the most significant maps in the history of science has been re-discovered in time for an important anniversary.

William Smith's 1815 depiction of the geology of England, Wales and part of Scotland is a seminal piece of work.

The first map of its kind produced anywhere in the world, only about 70 copies are thought to exist today.

Now, The Geological Society has turned up another in its own archives, ready to celebrate the map's bicentenary.

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