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Black and white view of a reinforced concrete water supply reservoir with a railway track on the dam, whose technical specifications are indicated at the bottom: height 35 m, thickness at the base 32 m, capacity 13 million m³. Reverse: handwritten text addressed to 'Mr. and Mrs. Belfort' at the Magenta villa, with a postmark from Champagny (Haute-Saône) dated 1936 and mention of the publisher H. Adain, Belfort.