Smith, Charles . An Elementary Treatise on Conic Sections By The Methods of Co-Ordinate Geometry / Textual Documents Charles Smith. - Rev.ed. / - New York : Macmillan and co , 1910. - 449p. : ill ; 18cm . ISBN: HB Subjects--Index Terms: Coordinate Geometry Geometry G-Mathematics T/G-Mathematics Dewey Class. No.: 515.56 / Sm 53 El