Beyond hitting up all the amazing people in the hobby for personal knowledge, I keep a reasonable research library around here. One that I'm always adding to. This is what I've got right now:
Still looking for a couple of Overstreets (1,2 and I can't find my #5,) but beyond that I'm hunting for some of the smaller catalogs (All Star, etc.) and am looking into putting together a full collection of Comic Book Marketplace…