Algebra programmed [by] Robert H. Alwin [and] Robert D. Hackworth. Alwin, Robert H. Hackworth, Robert D., joint author. Howland, Joseph W., joint author. Algebra Programmed instruction. QA154 .A49 512 19 ALA Parts 3-4 by R. H. Alwin, R. D. Hackworth, and J. Howland. Englewood Cliffs, N.J., Prentice-Hall [1969-71] [1969-71] 1969 Text 4 v. eng