Riverbank Publications No. 75 : Memorization Methods : Specifically Illustrated in Respect to Their Applicability to Codes and Topographic Material
Riverbank, Geneva Ill. Riverbank Laboratories Department of Ciphers 1919. First Edition. 50 pages 28.7 cm x 22.2 cm. Publisher's stiff tan wrappers with black printed front cover duplicating title page. No statement of limitation. A bright copy noting some minor soiling to the rear cover and a browned spot on..... More
