Pre-calculus mathematics a programmed text - Howes, Vernon E. (New York Wiley, 1967)
Book 1. Algebra.--Book 2. Functions and relations.--Book 3. Analytic trigonometry.
Later ed. published in 2 v. in 1975 under title: Essentials of mathematics--pre-calculus.
"Answer shield[s]" inserted in each book.
Stack Area (2-20-12)
Keywords: Mathematics--Study and teaching; Mathematics--Programmed instruction