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Postcard showing the impressive entrance to the Grand Thermal Baths in Châtel-Guyon, in the Puy-de-Dôme, described as a superb Roman monument with 134 mineralized hydrocarbon bath cabins with direct current and a constant temperature of 45 degrees. The reverse features a handwritten letter addressed to Madame Garigou in Marseille, with a 50-centime French postmark and a cancellation from Châtel-Guyon dated July 26, 1907.