Are We Giving Away Our State Secrets?; the Saturday Evening Post

Document A44766

618.8 KiB

PDF

Ciphers-by Herbert O. Yardley; the Saturday Evening Post

Document A44772

932.82 KiB

PDF

Codes-Article In the Saturday Evening Post

Document A44768

419.4 KiB

PDF

Cryptograms and Their Solution-by Herbert O. Yardley; the Saturday Evening Post

Document A44774

485.93 KiB

PDF

Double-Crossing America; Herbert Yardley Article In Liberty Magazine

Document A44769

537.81 KiB

PDF

Handwritten Note-Howell McConnell Mentioned

Document A44763

22.47 KiB

PDF

Handwritten Notes from Newspaper Articles

Document A44761

47.53 KiB

PDF

Secret Inks; the Saturday Evening Post

Document A44770

751.17 KiB

PDF