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<a href="//commons.wikimedia.org/wiki/Category:The_essentials_of_plane_and_spherical_trigonometry_(1887,_Leach,_Shewell_%26_Sanborn)" title="Category:The essentials of plane and spherical trigonometry (1887, Leach, Shewell &amp; Sanborn)">Category:The essentials of plane and spherical trigonometry (1887, Leach, Shewell &amp; Sanborn)</a></div>
<bdi><a href="https://en.wikipedia.org/wiki/en:Webster_Wells" class="extiw" title="w:en:Webster Wells"><span title="American mathematician">Webster Wells</span></a>
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