This is my third Calendar entry from the most excellent Geohipster spearheaded by @atanas, @billdollins and @gletham - the inaugural 2014 and the 2015 can be seen here - I missed last year but I told them:
Showing posts with label subsurface. Show all posts
Showing posts with label subsurface. Show all posts
Monday, 11 December 2017
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