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• 20:32, 11 September 2020 Scotfot talk contribs created page File:P804683.jpg (Entrance to a tunnel 300 yards long through the Chalk with Gravels and Boulder Clay overlying it. Members just coming through. Excursion to Hertford and Stevenage, May 2nd 1914. [http://pubs.bgs.ac.uk/publications.html?pubID=GA004#v=d&z=2&n=5&i=P802787.jp2&y=284&x=367 From the Geologists' Association Carreck Archive. The Reader Geological Photographs. 1914, 1916.])