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View of the entrance to a cave in Mas-d'Azil, with a path bordered by posts and wires. Printed text at the bottom: '7921. Le MAS-d'AZIL — Entrance to the Cave from the Mas-d'Azil Side'. Reverse: French 20-centime postmark, Mas-d'Azil dispatch postmark of 23 May 1921, handwritten address to 'Monsieur le Maire de la Gare, Le Cernieux, Seine'.