U-21 ship citations in the ship database
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We found information about the following specific ships:

SM U-21
Description: submarine

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

U-21

44 ship citations (5 free) in 39 resources

32 books (3 free)
1 journal (1 free)
6 web applications (1 free)
2 illustrations (1 free)
U 21 (German Navy U-boat) Subscribe to view
U 21 (German Submarine) Subscribe to view
U 21 (Submarine)
Web WorldCat
Published OCLC, Dublin, Ohio
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U 21 (submarine) Subscribe to view
U 21 (U-boat) Subscribe to view
U 21 (United State ship) Subscribe to view
U-21 Subscribe to view
U-21 (Ge) Subscribe to view
U-21 (German U-boat, World War II) Subscribe to view
U-21 (German) Subscribe to view
U-21 (Recreational; Washington, DC; 15 gross tons) Subscribe to view
U-21 (submarine) Subscribe to view
U-21 (submarine; built 1936; Germany) Subscribe to view
U-21 (U-Boat) Subscribe to view