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View of the hot water fountain in Dax, source of the Nèbe, with indication of its temperature (6.4 degrees) and its flow rate (2,500,000 liters per day). The reverse side features a handwritten letter dated January 3, 1918, addressed to Mrs. Leurin Matton in Saint-Brélidy, Landes, with a mention of the publisher Paul Derro at the bottom of the front side.