Mahmud, Sultan. A hand book of co-ordinate geometry : for higher secondary (classxi & xii) certificate examination of Dacca, Rajshahi, Jessore and Comilla Boards / Sultan Mahmud. - New rev. ed. - Dacca : East Bengal Publishers, 1965. - 282 p. : ill. ; 19 cm. 318 318 Subjects--Topical Terms: Co-ordinate geometry. Dewey Class. No.: 516.1 / S59h