I started working through two boxes of books and revues I inherited from a friend. It's a treasure trove - not many books, but well chosen ones. He was a killiekeeper and there are revues going back a very long time. Most are in French, but there are quite a few years of AKA journals. The ones from France are from before I joined their association, so I'll have some very good reading there.
There's a copy of the Innes Bible, with a trashy TFH cover on it, and a volume one Baensch Atlas in French.
Eventually, I need to organize and maybe someday index the shelves of killie articles I have here. They're written mostly by hobbyists for hobbyists, and are rich in info.
There is so much published hobbyist material out there from the pre-digital era, and very little of it has been put online. Most of it probably won't be. It's very high quality. There are lots of bright people in this pastime.