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First geological map of entire world, compiled by Austrian geologist Ami Boué (1794-1881) https://t.co/wVXi7Vh3t2 http://pic.twitter.com/SMexgm6fVa

— David Bressan (@David_Bressan) May 21, 2016

via Twitter https://twitter.com/David_Bressan

May 21, 2016 at 07:56PM