[TUHS] Unix Programmer's Manual, 3rd edition (1973) (fwd)

[Dave Horsfall]

Sent to me by someone not on this list; I have no idea whether it's been 
mentioned here before.

-- Dave

---------- Forwarded message ----------
To: Dave Horsfall <dave at horsfall.org>
Subject: Unix Programmer's Manual, 3rd edition (1973)

Hi Dave,

Some nostalgic soul has shared a PDF on the interwebz:

> MIT CSAIL (@MIT_CSAIL) tweeted at 3:12 am on Mon, Nov 04, 2019:
> #otd in 1971 Bell Labs released the first Unix Programmers Manual.
>
> Download the free PDF here: https://t.co/BYh3dAhaJU

I wonder what became of the first and second editions?