THE ULTRA SECRET
1974
First American Edition
Harper & Row Publishers [New York]
8vo (199 pages, index)
Hardcover in Dust Jacket [Cream cloth]
Item Number: 5565
$75.00
Description
This is a very good copy, in a slightly edge-chipped, slightly dampstained price-clipped dust jacket.
The first book published on the cracking of Enigma. The author supervised the dissemination of Ultra material.