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Black and white view of a natural rock tunnel in the Vercors, with a paved road and retaining wall. The reverse features a handwritten letter dated July 26, sent from La Tronche (Isère) to A. Ullmann at the Hotel de la Dent-d'Hérens in Mayens-de-Sion (Valais, Switzerland), with a 10-centime stamp and a postmark from Grenoble dated May 28, 1913.