If you look for the ultimate book, I recommend the last book to you.
It contains numerous b/w photos, drawings, color profiles, sea charts and specifications. (Language: English)
It is almost all submarine Captains contains, Submarine classes I, II, VII, IX, XXI, XXIII, all about the small combat Units like: "Hecht" (Pike), "Hai" (Shark) "Seeteufel (Seadevil), "Tümmler" (Dolphin) and many more.
The price in Germany amounts to approximately 100 Euro for it (~ 131 USD)
However, it may be very dearly that itself rewards !!
I even bought myself this book approximately one year ago, and it became a manual for me.
Deutsch: "Allzeit gute Fahrt und immer eine Handbreit Wasser unter dem Kiel".
English: "Always good trip and always a hand width water under the keel".
Best Regards from Germany..
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