Holt, Michael and Marjoram, D. T. E. — Mathematics through experience: nos. 4 & 5 (2 books).

Blond Educational, 1968. Reprint. Hardcover. No 4: clean hardback, tightly bound in pictorial boards, boards have minor rubbing at spine ends, name on front endpaper otherwise no inscriptions. 180 pages, diagrams in the text, tables. No. 5: published in 1968, clean and tightly bound paperback original, spine uncreased, card covers laminated, name on front endpaper. 250 pages, diagrams in the text, tables. Good with no dust jacket.