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Illustrated postcard depicting the Serre Ponçon Dam with a view of the lake, a small chapel on an island, mountains, and grazing sheep. The reverse details the technical characteristics of the dam: 1.2 billion cubic meters of water storage, 120 meters in height, 600 meters in thickness, and an annual production of 700 million kW. Publisher: Editions J. Cellard, 13, rue de l'Économie, Bron (Rhône).