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. Number "116" circled at top of front wrapper. Staples rusted, occasional light staining from damp, center..... More
