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Postcard showing the interior of a cave with rock formations and an underground river. The reverse indicates the publisher 'Sié des Cartes Postales APA - ROUX - Reprod. Imprimerie' and an address in Marseille. A 12-franc stamp of the French Republic is affixed, with a cancellation stamp from Labastide-de-Labouiche dated August 17, 1958.