SuDoc: HE 20.3502: M 91/2/996.
http://www.ninds.nih.gov/
Archive for August 2nd, 2013
Issuing Agency/Bureau: National Security Agency, Center for Cryptologic History
SuDoc Number: D 1.2:
Item Number: 0306
http://www.nsa.gov/about/_files/cryptologic_heritage/publications/revolution/Revolutionary_Secrets_2012.pdf
Format: online