JUAN, Jorge (1713-1773) & Antonio de ULLOA (1716-1795). Observaciones Astronomicas, y Phisicas, hechas de Orden de S. Mag. en los Reynos del Perù .. de las quales se deduce la figura y magnitud de la Tierra y se aplica a la navegacion, Madrid: Juan de Zuañiga, 1748, 4°, title in red and black, engraved frontispiece, 9 folding engraved plates and headpiece (one plate dampstained, perforation on title and accession number on following leaf), contemporary speckled sheep (very rubbed). [Palau 125472]