You might want to try these, all pretty good stuff, two being particularly suitable for an SH3 fan, there is of course the new Submarine Almanac too:
http://www.amazon.com/Type-VII-U-Boa...6210838&sr=1-1
http://www.amazon.com/Hunter-Hunted-...6210873&sr=1-2
http://www.amazon.com/Type-U-Boats-R...6210873&sr=1-7
If you go to amazon to buy any of these via the link on the front of this site, Subsim gets a cut of the price you pay too.

Chock