thumb|right|Paul Cézanne's Leda and the SwanNow in the Barnes Foundation Collection, Merion, Pennsylvania has been dated as early as 1868 and as late as 1886–1890; the best estimate is 1880–1882; Great French Paintings from the Barnes Foundation: Impressionist, Post-Impressionist, and Early Modern. New York: Knopf, 1993. 106.
thumb|right|Paul Cézanne's Leda and the SwanNow in the Barnes Foundation Collection Merion Pennsylvania has been dated as early as 1868 and as late as 1886–1890; the best estimate is 1880–1882; Great French Paintings from the Barnes Foundation Impressionist Post-Impressionist and Early Modern New York Knopf 1993 106