(029324) Zubiri, Xavier. On Essence. Washington, DC: Catholic Univ. Of American P, 1980. Hardcover. 8vo. 529 pages. Fine with no DJ. Binding is blue boards with gold lettering on cover and spine . Translated and introduction by A. Robert Caponigri. Translated from the Spanish 3rd edition of 1963. A deep philosophical treatise by a Spanish author, born 1898. ISBN: 0813205468 (Essence (philosophy)