Second U-boat Flotilla /

by Paterson, Lawrence
Published 2003

Leopoldville : a tragedy too long secret /

by Andrade, Allan, 1937-
Published 2009

U-boat: the secret menace.

by Mason, David, 1938-
Published 1968

U-boats offshore : when Hitler struck America /

by Hoyt, Edwin P. (Edwin Palmer), 1923-2005
Published 1978

The U.S. Army Air Forces in World War II : the battle against the U-boat in the American Theater /

by Warnock, A. Timothy
Published 1993

U-boats in New England : submarine patrols, survivors and saboteurs, 1942-45 /

by Wiberg, Eric T. (Eric Troels)
Published 2019