Essential arithmetic - Johnston, C. L. 1911- 4 0 (Carol Lee),16; Willis, Alden T.;Hughes, Gale M.; 5 (Belmont, CA : Wadsworth Publishing, 1984)
Series statement from: Intermediate algebra / A.T. Willis. 2nd ed. c1987.;Includes index.
Keywords: 2 -- 0; 6; Arithmetic. -- 20; 20; 2