Secret and urgent; the story of codes and ciphers
Title:
Secret and urgent; the story of codes and ciphers
Author:
Pratt, Fletcher, 1897-1956.
Personal Author:
Publication Information:
Indianapolis ; New York : The Bobbs-Merrill Company [1939]
[©1939]
Physical Description:
282 pages ; 25 cm
Language:
English
Format :
Book