A U.S.A. Resource

I'm currently in about 2/3 of the way through Dos Passos's 1919, the second installment in the USA trilogy. Because I allowed such a huge gap between my reading of the first installment and this one, I am having a hell of a time keeping track of characters and remembering who we know from 42nd Parallel, and how those characters relate and interact with the characters in 1919. I have search high and low, and haven't really been able to find much information about USA, specifically a character list. This is an egregious oversight on the part of book readers/bloggers. But today I stumbled upon this website, which is really excellent.