[stamped, JAN 6 1969]
Dear Dr. Landauer --
I had already been thinking (very crudely) along similar lines when your article appeared in Spectrum, as I was delighted to see.
Have you written any further on the subject? (Reprints would then be appreciated [mark to note, ([ . . .] also of the SPECTRUM piece.)]). Has anyone else?
Sincerely,
Joshua Lederberg
[written along right margin, Landauer 12-28-68 SAM]