NSA Pre-Releases William Friedman Docs 909 pp (PDF, 50MB)
   [1]http://cryptome.org/2015/03/nsa-friedman-15-0323.pdf
   24 Papers of 52,000 pp due in April 2015
   [2]https://www.nsa.gov/public_info/declass/friedman_documents/index.sht
   ml

References

   1. http://cryptome.org/2015/03/nsa-friedman-15-0323.pdf
   2. https://www.nsa.gov/public_info/declass/friedman_documents/index.shtml