[cfmcdonald]

I believe the . is a typo, and it's 27 years. That also lines up with the date he gives for his death, in 1970.

[hjek]

Probably an OCR glitch even, as the text has some OCR cliches in it:

> and regard these as black-and-white altematives.

Related: https://news.ycombinator.com/item?id=18374359

[YeGoblynQueenne]

Duh. You're right, simplest explanation.

Cheers :)