Mexico City: Biblioteca Era, 1973. First Edition. Octavo. Number 2956 of 3000 press-numbered copies. A wonderful association copy, SIGNED by Paz and lengthily inscribed in Spanish to noted curator Kynaston McShine in the year following publication. Several minor emendations to the text in Paz's hand; his landmark study of Marcel Duchamp, illustrated throughout, if sparingly. Near fine in illustrated wrappers, spine lightly toned.