Design Studies of German Submarines by the US Navy
| The Design Study of Type IXC U-boats was made available by Scott Sorenson. |
| The Design Study of Type XXI U-boats was made available by the Portsmouth Naval Shipyard Public Affairs Office and the Navy Yard Museum - in particular Debora White, Gary Hildreth, Jim Dolf and Bill Tebo (a member of the US Navy crew of U-2513). |
| Photographs and documents of surrendered German submarines and their crews were made available by John Cunningham (a member of the US Navy crew of U-2513). |

| U-2513 off Key West, Florida - 30 October 1946 |

| U-873 in dry dock at Portsmouth Naval Shipyard - 30 June 1945 |