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Correspondance: 1932-1960, p.220, Gallimard, 1981.[https://books.google.com.br/books?id=56VcAAAAMAAJ&q=le+train+du+monde+m%27accable+en+ce+moment.+a+longue+%C3%A9ch%C3%A9ance,+tous+les+continents+(jaune,+noir+et+bistre)&dq=le+train+du+monde+m%27accable+en