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View of the caves of La Balme in Isère, with a man in a boat on an underground lake. Printed text at the bottom: '16 — Caves of La Balme (Isère) — Over the Lake'. Reverse: French 10-centime postmark, postmark 'SILA BALME 21-8-30', address to Madame Boursac in Lyon, and handwritten text including 'Ramette - Berbille - Li Hémille - Jean - Boursac - Lyon'.