Algebra, a personalized approach / George L. Henderson, Walter W. Leffin, Mary I. Van Beck. Henderson, George L. Leffin, Walter W., joint author. Van Beck, Mary I., joint author. Algebra. QA154.2 .H46 512.9 HEA Includes index. Boston : Prindle, Weber & Schmidt, c1976. c1976. 1976 Text xiii, 578 p. : eng