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Ships containing U-21
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Nile
Noelani
North Star
North Wind
Northampton
Northern Light
Northwind
Nymphe
O-21
Oberon
Ocean
Ocean Maid
Ocean Queen
Oceanic
Odessa
Ogden
Olajean
Olga
Olive Branch
Omega
Oneida
Ono
Onward
Ophir
Oracle
Orange
Orca
Oregon
Orient
Orion
Os
Osprey
Oswego
Ottawa
Otter
Owen
Pacific
Pallas
Pan-Gulf
Panama
Pandora
Panikos
Paragon
Pasadena
Pathfinder
Patrick Henry
Patriot
Pau Hana
Pearl
Pegasus
Peggy
Pelican
Pembroke
Penelope
Penguin
Peregrine
Perla
Petrel
Phantom
Philadelphia
Phoebe
Phoenix
Pigeon
Pilgrim
Pioneer
Piranha
Pirate
Pocahontas
Polaris
Pollux
Polly
Poseidon
Potomac
Premier
President
Preston
Prime
Prince
Prince of Wales
Prince William
Princess Amelia
Princess Louise
Princess Royal
Priscilla
Prize
Procyon
Proteus
Providence
Puget Sound
Pursuit
Queen
Queen Mary
Quest
Rabaul
Radiant
Rainbow
Raleigh
Ranger
Rattlesnake
Raven
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