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Postcard showing a monument in a forest, with the inscription 'Coll. Riquet' at the bottom. The reverse indicates that it shows the area around Vivières (Aisne), with a mention of the Haut de Retz Observatory where General Mangin directed the attack on July 18, 1918. 20-centime stamp and Vivières postmark of July 22, 1918. Handwritten correspondence addressed to Neully-sur-Seine.