Just to add something to that. It's not something that gets brought up a lot, but there's this page on Candlekeep. Not the easiest site to navigate, but...
http://www.candlekeep.com/library/artic ... /start.htmBasically its an A-Z. There's a topic you want to know about, you go on to the list and find it....click it...
And it takes you to a page that tells you every page in every sourcebook that details said subject, however detailed/vague. Easiest way to know what pdfs you should be googling. Real handy resource if you're interested in this forum.