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Etching, burin, and aquatint on Vélin de Rives paper – From the book with engravings Trente Ans D’Activité, composed of works by the most recognized artists of the time, completed on July 4, 1971: Jean Arp, Lynn Chadwick, Marc Chagall, André Dunoyer De Segonzac, Max Ernst, Marino Marini, Henri Matisse, André Masson, Joan Miró, Henry Moore, Pablo Picasso, David Siqueiros, Jacques Villon, and Zao Wou-Ki. – The portfolio case was designed by Alexander Calder.