I am interested in learning more about the history of secret societies, particularly in the context of American colleges. Doesn't even necessarily have to be secret; fraternities and other notable college organizations are good too. Anything from 18th-20th century. I know this is a popular subject, and there are tons of books on it, but it's hard to know what is reputable and what is not. There's a lot of conspiracy theory stuff out there, and a lot of conjecture meant to stoke the imagination, but I'm not really interested in that.