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Aerial view of the salt marshes of Le Croisic, with rectangular ponds and piles of salt. Printed text at the top: '737. LE CROISIC (L.-I.) — Salt Marshes AB'. Reverse: blue 10-centime stamp, postmark from Paris (10 IX 1929), handwritten address to 'Monsieur d'Azema, Fond de Géze', and two sorting stamps from Algiers (11 IX 29).