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Advertising postcard for the Caves of Bétharram, featuring a road map with distance indicators to Pau, Tarbes, Lourdes, and other locations. The front highlights stalactites and stalagmites with text praising the beauty and accessibility of the site. The reverse details the different rooms and geological formations to visit, such as the « Fortified Castle », the « Underground Lake », and the « Gothic Cathedral ». The publisher is IMP. PRINCES - PARIS.