8vo. Volume I: Logique, Metaphysique: 241 pp., [1] / Volume II: Physique, Mathematiques: 276 pp., [1], illustrations, publisher’s original wrappers, translated from Persian text, appendix, notes, volume 2 Unopened, light toning to covers, otherwise set clean & in very good condition, published in accordance with Unesco & Tehran University under the patronage of Guillaume Bude Association, Societe d’Edition Les Belles Lettres, Paris, 1955.