Published by Published by the author (printed by Faseyprint, London), London, 1981
21 x 14.5 cm, paperback [stapled booklet], iv, 60, (8) pages, Text in English, slightly browned, very good condition, see picture. Self-published guide to the Rubik's Cube by mathematician David Singmaster. Includes notation, solving methods, and early analyses of cube group structure. 100g.