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Ships containing U-20
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Abyssinian
Acadia
Achilles
Active
Adams
Addison
Adelaide
Adolph J.
Adriatic
Adventure
Adventuress
Advocate
Aeolus
Agamemnon
Ajax
Akula
Albany
Albatross
Albion
Alchemy
Alert
Alexander
Alexandra
Alfred
Alibi
Alice
Alliance
Alligator
Almar
Almirante
Alpha
Altair
Amberjack
Amelia
America
American Eagle
American Legion
Amerika
Amity
Amphitrite
Amsterdam
Andromeda
Anemone
Angelina
Angler
Ann-Marie
Anna
Anna Maria
Anne
Antelope
Anthony
Antigone
Antonia
Apache
Apollo
Aquarius
Aquila
Archerfish
Arcturus
Ardent
Argentina
Argo
Argonaut
Argyll
Ariadne
Ariel
Arrow
Ashburton
Aspen
Asturias
Atalanta
Athena
Atlantic
Atlantis
Atlas
Audacity
Auk
Aurelia
Aurora
Australia
Avalon
Avenger
Baltallinn
Baltic
Baltimore
Barbara
Barbro
Barclay
Barnegat
Barnes
Barracuda
Barrier
Basalt No. 1
Beacon
Beagle
Bear
Beaver
Bellatrix
Beluga
Belvedere
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