Chawla, L. M. Elements of analytical conics / L. M. Chawla and Nassir- Ud-din. - 3rd rev. ed. - Lahore : Ripon Book Depot, 1959. - 373 p. ; ills. : 18 cm. 312 312 Subjects--Topical Terms: Geometry. Dewey Class. No.: 516 / L1e