As mentioned, I have a huge library (ca 30000 books). I'm in the prosess of making a proper inventory, but it's going very slow - especially as I'm adding more books than I'm able to register (I've spent an average of almost $7000 on books for the last 10 years or so :-/ ).
Anyway: I did a quick search and found some uboat-related titles (some are probably not relevant, and I'm sure I have more) which I put it in the attached list. Unfortunately, I was not able to include author/publisher/ISBN etc.I can't browse all of these of course, but if there's a couple of books you might suspect have relevant info, I can check when I have an opportunity (and if the book in question is readily available...).
PS: In addition to books, I have of course a lot of scanned WW2 archive-material from US, german, british and norwegian national and other archives/museums, including about 2000 german handbooks/manuals, and about 3 million pages of other (mostly) german stuff; for instance about 3000 digital copies of NARA RG242 microfilm rolls, including the (probably) close to complete surviving records of the U-boot KTB's.