It is heavily based on a book by Timothy Egan "The Worst of Times."...with other sources
Read all Timothy Egan books you can.
I am currently into "Short Nights of The Shadow Catcher".. about photographer Edward Curtis and his effort to record Native American history and photos at the turn of the Century. Timothy Egan again. The photos aren't that great in this book, so I suggest getting a photo book from the library. See what he was really up to...
Off to more PBS history.