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Postcard illustrating the valleys of the Oust and the Nantes to Brest Canal, with a map and several photos of places such as Pontivy, Josselin, Rochefort-en-Terre and Redon. The back indicates the publisher: Les Éditions du Gabier, in Saint-Herblain, with a trademark and full address. The postcard is dated February 24, 1946.