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Black and white view of the 'Hall of Sacrifice' in the Rochefort Cave, with several human silhouettes inside. On the reverse, handwritten address to Idette Boulay in Chorce, Loir-et-Cher, France, with a postmark from Château-Neuf-sur-Loir dated August 15, 1906. A 15-centime Belgian stamp canceled in Brussels.