Wyvill, Ronald & Hames, Jack — Modulo arithmetic, with, Triangles galore.
Førsteudgave
Copyprint on Education, 1966. First Edition. Softcover. 2 clean and tightly bound paperback originals, stapled spines, coloured paper covers with school stamp on front cover otherwise appear little used. 36 pages, diagrams in the text. Triangles is undated. Very Good.
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£7.00 (€8.39 | $9.25 | ¥1,477)