Kells, Lyman M. Plane and spherical trigonometry / Lyman M. Kells, Willis F. Kern, James R. Bland - 3rd ed. - [Mandaluyong City]: National Book Store, [distributor], c1978 - ix, 290p. Originally published: McGraw-Hill, 1951 ISBN: 971-08-1917-8 Subjects--Topical Terms: Trigonometry Dewey Class. No.: 516.24 K29 1978