SACROBOSCO, JOHANNES. Sphera... [Edited by H. de Nuciarellis]. Venice: Impensa heredum O. Scoti & sociorum; [B. Locatellus pr.:], 19 Jan. 1518 [colophon]. Large woodcut armillary sphere on A4v, printer's device at end, and numerous woodcut diagrams in text. Folio, later vellum; some marginal dampstaining (mostly at beginning and end), some marginal worming, lacks final blank (GG6). STC/Italian, p. 596; Riccardi I, 447-49 ("rara collezione"); Sotheran Supp. II, 3790 ("unknown to Lalande"); Lynn Thorndike, The Sphere of Sacrobosco and Its Commentators (Chicago, 1945), p. 343 ("...distinctly superior to the incunabulum of 1499...rare"). Very rare.