Notation as a Tool of Thought by Kenneth E. Iverson – 1979 Turing Award Lecture
I saw this lecture tweeted with a link to a poor photocopy of a double column printing of the lecture.
I think you will find the single column version from the ACM awards site much easier to read.
Not to mention that the ACM awards site has all the Turing as well as other award lectures for viewing.
I suspect that a CS class could be taught using only ACM award lectures as the primary material. Perhaps someone already has, would appreciate a pointer if true.