The elements of Euclid : viz. the first six books, together with the eleventh and twelfth. ... Also the book of Euclid's Data, in like manner corrected. By Robert Simson, ... To this sixth edition are also annexed, Elements of plain and spherical trigonometry. - Euclid. (printed for J. Nourse, London, and J. Balfour, Edinburgh, 1781)