http://www.uwishunu.com/2015/03/coming-attraction-the-barnes-foundation-to-show-two-just-discovered-and-never-before-seen-works-in-cezanne-uncovered-debuting-friday-april-10/
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Two unfinished sketches by Paul Cézanne were astonishingly discovered on the reverse sides of two existing Cézanne watercolors in the Barnes Collection during a recent paper conservation treatment.