I won't say exactly how long it's been, but long enough to have a copy of the Bat Book, signed by Eric Allman.
Somewhere at home I still have my yellow "Green Card," and a few O'Reilly Nutshell handbooks (like my guides to programming with curses, and termcap and terminfo) that were stapled together, with covers that look as if they were made out of paper grocery bags.
Mark
Yes but do you have a MVS “POO” manual?