There are some cracking discounts on pre-dreadnought and WW1 naval digital books for the Kindle at the moment including this book on the siege of Tsingtau, which I thought about getting ages ago but didn’t because it was too expensive. There’s also a couple of books by Norman Friedman, which are always packed full of detailed information but normally cost a fortune. I decided to download The Kaiser’s Battlefleet by Aiden Dodson, however as it’s spot on for what I’m interested in and at £1.19 you can’t go wrong!.