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Interior of the library of the École Polytechnique, showing rows of wooden tables and benches, bookshelves filled with books, and busts on a gallery. Printed text at the bottom: 'École Polytechnique. — The Library'. Reverse: green 5 cent postage stamp, postmark from Toulouse dated August 15, 1915, handwritten address to Madame Gourret in Marseille, and signature 'Léon'.