Thwaytes, Robert The elements of conic sections freated geometrically : with numerous exapmples, illustrations and extracts from newton'o princlpia on the theory of limits / by Robert Thwaytes - Calcutta : Sanders Cones, 1856 - 82 p. ; 21 cm. Subjects--Topical Terms: GeometryGeometry, Plane Dewey Class. No.: 513.1