I was searching today to find where the Unix pipeline spell checking method "tr | sort | uniq | comm" was first published. I found it in a document by Brian Kernighan titled "UNIX for Beginners". "The pipe mechanism lets you fabricate quite complicated operations out of spare parts already built. For example, the first draft of the spell program was (roughly) [...]" http://www.psue.uni-hannover.de/wise2014_2015/material/Unix-Beginners.pdf#p… Then my problem became properly citing the document. Searching on Google, Google Scholar, and IEEE Xplore didn't help me. In the end I found the reference in a 1993 refer file of all Bell Labs Computer Science Technical Reports I had saved from my student days. %cstr 75 %report Comp. Sci. Tech. Rep. No. 75 %keyword CSTR OBS %author B. W. Kernighan %title UNIX for Beginners %date February 1979 %journal UNIX Programmer's Manual %volume 2 %other Section 3 %date January 1979 %type techreport obsolete I couldn't find the refer file online, so I'll send a copy to Warren for archiving. However, I'm wondering whether we should/could do something to also archive the actual pages of all the Bell Labs Computer Science Technical Reports. I think some are the only authoritative primary source for many Unix-related gems and a lack of an electronic archive means they will slowly fade into non-existence. I remember we had many of those at the library of Imperial College London. Any suggestions on what we can do to archive this material? Diomidis