Secret and urgent

the story of codes and ciphers

by
No cover

Fletcher Pratt: Secret and urgent (1939, The Bobbs-Merrill Company)

282 pages

English language

Published Jan. 19, 1939 by The Bobbs-Merrill Company.

OCLC Number:
795019

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3 editions

Subjects

  • Cryptography.
  • Ciphers.