In Duckworth’s Home Computing Series. Covering how to receive short-wave radio signals with a computer (including a listing of the BASIC program that would have been necessary at the time), as well as discussing code-breaking and the use of ciphers. Paperback, pictorial covers, 239 pages. Publisher’s ‘With Compliments’ slip left laid in. Condition: A little edge wear, light rubbing/bumping to one corner, but appears unread.