I am not sure if this is in the right place but I thought I would give a quick shout to Mr. Taffin and his new book.
My copy just came today and I can't wait to dive in. It is very extensive and goes into detail by manufacturer and model or series.
I am heading up to the desert for some shooting this weekend and will bring the book for the down time.
If you like double actions, I am sure you will love this book.