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Postcard showing the ruined keep of the fortified castle of Montlhéry, accessible by 132 steps and located at an altitude of 114 meters, with a height of 32 meters. The back features a handwritten letter to Mademoiselle Madelaine Binouis in Saint-Amand-de-Vermond, with a 5-centime postage stamp and a cancellation from Hendecourt (Oise) dated July 27, 1906.