U-Boats in action (Squadron/Signal Publications 4001)

Germany's U-Boat offensive and the types that fought it. Provides the most full and complete reference yet on this fantastic subject. Includes Type I, Type II, Type VII, Type IX, Type X, Type XIV, Type XVII, Type XXI, and Type XXIII. Also covers torpedoes, schnorkels and rockets. 110 photos, over 40 detail drawings, 2 pages color drawings.