Which sez: There is a second document, untitled, no date, which I have not been able to locate online at all. .. From the content, it seems to be from shortly after the previous one, so say, circa 1977. I poked around in a dump of the CSR Unix which I now have available to me, and found a copy of it. I just checked the Internet (using the canonical search engine) for various phrases from it, but I still could not turn it up. So, here it is in machine-readable form: http://ana-3.lcs.mit.edu/~jnc/history/unix/CChanges.txt Hope this is some use to someone... :-) Noel