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Northwest Passage - Wikipedia
Northwest Passage - HISTORY
What is the Northwest Passage? A Map and a History. - Geology.com
Northwest Passage | Definition, Explorers, Map, & Facts
These Maps Show the Epic Quest for a Northwest Passage
The Northwest Passage - ArcGIS StoryMaps
Northwest Passage: Brief History and Origins of Exploration - TIME
Northwest Passage summary | Britannica
Northwest Passage | The Canadian Encyclopedia
Sir John Franklin sought the Northwest Passage—then vanished