1
Published 2015
Center for Cryptologic History, NSA
Subjects: ...Cryptography / History / Bibliography / Catalogs...

2
by Rubin, Frank
Published 2022
Manning Publications
Subjects: ...Cryptography / History...

3
by Schindler, John R.
Distributed by the National Security Agency, Center for Cryptologic History
Subjects: ...Cryptography / History...

4
by Benson, Robert Louis
Published 2001
Center for Cryptologic History
Subjects: ...Cryptography / History...