Don't quite see where you are coming from, amos2.
HTBJ is an excellent book. As for the 20 yrs part, maybe we don't see 707 etc anymore, HTBJ is not about EFIS and FMS. It is about gas turbines, upper atmosphere, and very large aeroplane handling. Haven't seen a book that can replace it yet.
Another classic worth digging up is "Fly the Wing." Excellent read for anyone about to do line training on their first jet.
Sorry Wemac, I'll be keeping mine!