SM U-21 (Germany)

Short descriptions

• ja 潜水艦
• de Deutsches U-Boot
• pl niemiecki okręt podwodny

📚 Books cited here, by reader rating

The U-Boat War, 1914-1918

★ 4.0 · 2 ratings

Raiders of the Deep

Lowell Thomas

★ 5.0 · 1 rating

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