Almost exactly at the same time as The Real Book's publication, appeared the Lions' Commentary on Unix v6 (https://en.wikipedia.org/wiki/Lions%27_Commentary_on_

Almost exactly at the same time as The Real Book's publication, appeared the Lions' Commentary on Unix v6 (https://en.wikipedia.org/wiki/Lions%27_Commentary_on_UNIX_6th_Edition,_with_Source_Code https://en.wikipedia.org/wiki/Lions%27_Commentary_on_UNIX_6t... ). Also disseminated via surreptitious copies at first, also ultimately legally published.