Riverbank Publications No. 20 Several Machine-Ciphers and Methods for Their Solution 1st impression

by William F. Friedman

$300 · Offered by Kuenzig Books

First edition

Riverbank, Geneva Ill. Riverbank Laboratories Department of Ciphers 1918. First Edition. 2 , 1 -58, 28 pages 28.5 cm. Provided in the originally issued Riverbank Laboratories button and string flapped manila envelope with limitation number on outside tear at flap fold . Individually numbered limitation of 200 copies so stated on copyright page . Stiff tan publisher's wraps with cover titles duplicating title page and

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