ISOU (Isidore). The Nuclear Theory of Planning, an eco-nuclear conception of programming (external, internal and creative) for the reform of current planning. Paris, Isidore Isou, Librairie Anglais, 1966. Small in-8, bradel black half-maroquin, black and white two-tone front cover decorated with a collage forming the word theory, untrimmed, cover and spine, slipcase (Mercher). First edition. One of 20 copies on de luxe paper, signed by the author, containing an original gouache and ink drawing by Isidore Isou. A precious copy from Jean Petithory (1931-1974), director of the avant-garde bookshop-gallery Les Mains libres, publisher and patron of the Lettrists, with this autograph letter signed by the author: to Jean Petithory, [La Théorie nucléaire de la planification] of which he read and corrected the proofs - where, despite his extreme care, he apparently still left some "typos" - which would tend to prove that the field of mechanics exceeds man's current possibilities, as a token of affection, Isidore Isou, 67. Very fine binding signed by Mercher.