• Current opened records
 

  • Secret and urgent the story of codes and ciphers

Book
CID:
  • 26609
Date:
  • 1942
Creator:
Publication Information:
  • Blue Ribbon Books
Call Number:
  • Z104 .P92 1942
Physical Description:
  • 282 p., 3 β. diagrs. 21 cm.
Subjects TXT:
  • Ciphers.Cryptography.
Contact: