OK, there are three documents which sort of fall into this class. First, there is something titled "New C Compiler Features", no date, available here: http://minnie.tuhs.org/cgi-bin/utree.pl?file=Interdata732/usr/doc/cdoc/news… no date, but it appears to describe an early version of the so-called 'Typesetter C', mentioned in other documents, so this would be circa 1976 or so. There is a second document, untitled, no date, which I have not been able to locate online at all. I scanned my hard-copy, available here: http://ana-3.lcs.mit.edu/~jnc/history/unix/CImprovements1.jpg .. http://ana-3.lcs.mit.edu/~jnc/history/unix/CImprovements5.jpg circa 1977. Sorry about the poor readability (it looked fine on the monitor of the machine my scanner is attached to); fudging with contrast would probably make it more readable. When I get the MIT V6 Unix tapes read (they have been sent off to a specialist in reading old tapes, results soon, I hope) I might be able to get more info (e.g. date/filename), and machine-readable source. Finally, there is "Recent Changes to C", from November 15, 1978, available here: http://cm.bell-labs.com/cm/cs/who/dmr/cchanges.pdf which documents a few final bits. There is of course also Dennis M. Ritchie, "The Development of the C Language", available here: http://cm.bell-labs.com/who/dmr/chist.html which is a good, interesting history of C. I found several documents which are bits and pieces of this. http://ana-3.lcs.mit.edu/~jnc/history/unix/C_Backport.txt http://ana-3.lcs.mit.edu/~jnc/history/unix/V6_C.txt Too busy to really clean them up at the moment. Noel