Reading, UK: Educational Explorers, Ltd.; 1961 rev edition/1960; vlack and red swirl cover, white back; 92 pp. Reference Education.
Chapter 1 The Algebra of the Set of Coloured Rods, (for the teacher) Chapter II The Arithmetic of the Coloured Rods, Chapter III The Geometry of the Coloured Rods. Conclusion, full Biobliography of English classroom books by these authors.
CONDITION: Very Good Plus; small ink name on cover and half title, otherwise Near Fine. Item #22690