The oldest such book on the shelf behind me as I type is the Conference Digest from the 1970 Computational Physics Conference in London. Plenty of good stuff in there (along with some typesetting techniques never to be seen these days - typewritten equations with hand-drawn symbols (such as the integral sign) added later!).
I no longer have it, but for many years I retained an 11x14 printout of the man page from perl4 (IIRC 4.036). This was the text from which I originally learned Perl and which I went back to time and again as a reference. Nowadays the prevalence of perldoc and the splitting of the one man page into many means that this approach is obsolete, of course.