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![[GREENOUGH, George Bellas] A Geological Map of England and Wales](https://i0.wp.com/crouchrarebooks.com/wp-content/uploads/2025/03/12588_1H.jpg?fit=1560%2C1900&ssl=1)
Rare reduction of Greenough’s geological map of England and Wales 
The earliest working chart to depict Magnetic Variation 