5th December, 1962.
Dear Marshall,
Very many thanks for your congratulations on the Nobel prize and for your most interesting preprint.  I had one from Severo at about the same time, and was delighted to find that both of you are uncovering more triplets.  We are all intrigued by your reference to "quantative work" . . . Shows that some codewords are triplets" and look forward to seeing the data.  I wish I could get to the bottom of the degeneracy -- it's clearly not random but what it is baffles me.
Did you ever write that article for Scientific American?
F. H. C. Crick