Wheeler, Henry Nathan. The elements of plane trigonometry. Boston: Ginn & Heath. 1877. x, 109 pp. 12°,
**E 5017.87 Same. [Revised ed.] Boston: Ginn & Heath. 1878, xii, 112 pp. 12°. No. 1 in **E.5017.86
-Trigonometry. ae Plane.