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Senest opdateret 30. januar

Af R.A.Haldane

fra 1976 på forlaget Robert Hale & Company, London

ISBN: 0709153511

pris: 70 kr – stand: ★★★★★

In this book the author sets forth the story of hidden writing from earliest times to the present. In simple terms he explains how ciphers and codes work and how they are unravelled. 207 s. Hardcover.