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Interior view of the Etarram caves, showing impressive stalactites and a paved path. Printed text at the bottom: 'Les Dépressions. 2. Grottes de l'Etarram. Lower Part of the Laches'. Reverse: handwritten message addressed to Mr. Caugnad in Paris, dated 1922, with a 40-centime postage stamp and a Bâle dispatch postmark.