Seminal series of pamphlets on solving ciphers written at the Riverbank Laboratories, 1917-1922, based on codebreaking experience during World War I and after.
Writing a summary for young readers…
For young readers
Book data: Open Library
Seminal series of pamphlets on solving ciphers written at the Riverbank Laboratories, 1917-1922, based on codebreaking experience during World War I and after.
Book data: Open Library