On 24 November 1975, NASA sponsors a workshop (“A Workshop on Cultural Evolution”) chaired by Joshua Lederberg on the evolution of intelligent life and technological civilizations.
Black, David C and Stull, Mark A in “The Search for Extraterrestrial Intelligence : NASA Special Publication 419 (“NASA SP 419”)” (1977) (edited by Morrison, Philip and Billingham, John and Wolfe, John) at page 69 (in Section 2, in Colloquie 6) of the National Aeronautics and Space Administration softcover edition. Text of relevant report available free online at: http://history.nasa.gov/SP-419/contents.htm
Stull, Mark A in “The Search for Extraterrestrial Intelligence : NASA Special Publication 419 (“NASA SP 419”)” (1977) (edited by Morrison, Philip and Billingham, John and Wolfe, John) at pages 27-30 (in Section 2, in Colloquie 2) of the National Aeronautics and Space Administration softcover edition. Text of relevant report available free online at: http://history.nasa.gov/SP-419/contents.htm
