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Derry - Wikipedia
Londonderry | History, Name, & Map | Britannica
County Londonderry - Wikipedia
Visit Derry | Welcome to the Walled City
Derry-Londonderry | Ireland.com
Londonderry | Northern Ireland, UK History & Culture | Britannica
Londonderry summary | Britannica
Derry – Travel guide at Wikivoyage
Derry (Londonderry) travel - Lonely Planet | Northern Ireland, …
County Londonderry – Travel guide at Wikivoyage