How many members dig into the 'old stuff'??
I do. I think it helps me in the field to know about old technologies and how things were done in the past. It can sometimes aid in troubleshooting. I also collect some of the neat things I rip out, and come across at garage sales and flea markets.
I have a few old books. One that I think is interesting is a single volume from "Audel's New electric Library." It from 1938 with alot of older stuff from past editions. It is the one that includes building wiring, some theory, and stuff on power distribution. It explains how to install knob and tube. I also find it interesting where it shows steps and photos on how a joint is made in high voltage lead sheathed cable. A lot of work!
Some of my books aren't even that old, I have do-it-yourself wiring books from the 50s, 60s, 70s, and there is some interesting and odd stuff in them as well.