Generalized geology of the Ardenne-Eifel area & Ardennes slate belt - apparently first place term Boudin was used #geology #thestoryofslate http://pic.twitter.com/eUZqhbraJg
— John Van Hoesen (@Taconic_Musings) November 29, 2016
via Twitter https://twitter.com/Taconic_Musings
November 29, 2016 at 07:32PM
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