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1
Published 2015
Center for Cryptologic History, NSA
Subjects: “...Cryptography / History / Bibliography / Catalogs...”
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2
by Schmeh, Klaus
Published 2017
Heise
Subjects: “...Cryptography / History...”
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3
by Schindler, John R.
Distributed by the National Security Agency, Center for Cryptologic History
Subjects: “...Cryptography / History...”
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4
by Benson, Robert Louis
Published 2001
Center for Cryptologic History
Subjects: “...Cryptography / History...”