A geologic map of England w/inset depiction of Honister Crag, one source of slate in the Lake District, UK c.1849 #geology #thestoryofslate http://pic.twitter.com/DFlIaRjoA1
— John Van Hoesen (@Taconic_Musings) December 29, 2016
via Twitter https://twitter.com/Taconic_Musings
December 29, 2016 at 08:31PM
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