We found information about the following specific ships:


We also found the following citations which are not yet associated with specific ships:

U-21:

35 ship citations (5 free) in 30 resources
Web WorldCat
Published OCLC, Dublin, Ohio
U 21 (submarine) Subscribe to view
U-21 (Ge) Subscribe to view
U-21 (German U-boat, World War II) Subscribe to view
U-21 (Recreational; Washington, DC; 15 gross tons) Subscribe to view
U-21 (submarine) Subscribe to view