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Type XXIII submarine - Wikipedia
Bronco 1/35 scale German Type XXIII U-boat | Finescale Modeler Magazine
U - Boat Type XXIII. German Submarine (Plastic model kit) 1/144 ICM S.004 | eBay
1/144 U-Boat Type XXIII - FineScale Modeler - Essential magazine for scale model builders, model kit reviews, how-to scale modeling, and scale modeling products
Trumpeter 1/144 Type XXIII U-boat, by Tom Cleaver
U-Boot Type XXIII, ICM S.004 (2005)
U-Boat Type XXIII by Chris Wauchop (Special Navy 1/72)