Warren, S. Edward. 1878. <i>Elements of Plane and Solid Free-Hand Geometrical Drawing, with Lettering; and Some Elements of Geometrical Ornamental Design, Including the Principals of Harmonic Angular Ratios, Etc. In Three Parts ... for Draughtsmen and Artisans; and Teachers and Students of Industrial and Mechanical Drawing</i>. [2d ed. J. Wiley &amp; sons.