7 *#*E 250898255 Mac Clelland [M*Clelland|, William John, and Preston, Thomas « ; A treatise on spherical trigonometry, with numerous examples. Part 1, 2. London: Macmillan and co. 1886. 2v. Sm. 8°
«Preston, Thomas, aap .. Ae, jt. author.
-Trigonometry, Spherical.