Thanks for the great suggestions...even though these are generally not full downloads. I was rummaging around here and on the interwebs for good Sub books. As much as I love the Forum I also like a actual book in my hands, I'm old school that way. Just scored Skeet and Urul's "Vintage Rolex Sport Models" for cheap - (@tripdog recommended!) Rolex Magazine #6 (deals with sub history..not substantial but eye candy) and the 2017-18 hardcover Rolex catalog...more eye candy and useful latest dial reference. If anyone has Mondani's " Collecting Rolex Submariner" and can tell me if it is worth it I am mulling one over I can buy for 250ish..but not sure about it.