1. Albert , A. A. 1941 . “Some Mathematical Aspects of Cryptography,” address to the November 22, 1941 meeting of the American Mathematical Society at Manhattan, KS. An amplification of that presentation appears in Block, R. E., N. Jacobson, J. M. Osborn, S. J. Saltman, and D. Zelinsky, eds.A. Adrian Albert Collected Mathematical Papers, Providence, RI: American Mathematical Society, 903–920.
2. Albert , A. A. 1965 . “Letter to David Kahn, March 24, 1965.” Fort George G. Meade, MD: David Kahn Collection at the National Cryptologic Museum Library.