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Interior view of the Grottes de Rian, La Mosquée, showing impressive stalactites and stalagmites, with a wooden staircase. On the back, a postcard signed 'Christianne' and addressed to 'M. et Mme Véron, 4 Rue de la Pointe Raguet, Soisy-sous-Montmorency (France)', with an 8-franc stamp and a dispatch postmark 'AISNE'.