My friend brought me this, saying "I just found this in my junks, thought it might be useful for you. Weren't you a programmer?"

At first I thought I should explain about how fast everything changes over here and how it is out of style to talk about 2000s technologies, let alone a book from 1973!
I just said "Thanks! In fact it is a precious antique. I'll add it to my collection."
It really is.