Old Books for world building?
My current campaign is coming to a close and I'm thinking of doing a Ravenloft Campaign next. I've never played in the world of Ravenloft so I want to become more familiar with the world as a whole.
I own "Curse of Strahd" and "Van Richten's Guide to Ravenloft" but I am wondering if there are any old books that might be worth tracking down and reading.
I know there are a ton but some would be less useful for a 5e game. Something with lots of DM goodies like "Van Richten's Guide to Ravenloft" is ideal. Adventure Modules could have some interesting idea to pull from. Player options for older editions are pretty hard to use in 5e.
I think the other "Van Richten's Guide" books might be a good place to start but I don't know what else is good to pull stuff for a modern game. So any recommendations would be appreciated. TYIA