Hi, Matt:
The only book I know that has a large selection of photo different from the ones regularly seen is the book I wrote about ten years ago with Ken Marschall and Bill Sauder. It runs about 50 pages and is soft cover. There are 110 illustrations, and 85 of them had not been seen since 1915. The book focuses on the ship and her interiors rather than the people on aboard, the politics, or the sinking. If you're interested in a copy, please contact me off the board.
Eric Sauder