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1911 Encyclopedia Britannica
(Thlewechodyeth, or "Great Fish"), a river in Mackenzie and Keewatin districts, Canada, rising in Sussex lake, a small body of water in 108° 20' W. and 64° 25' N., and flowing with a very tortuous course N.E. to an inlet of the Arctic Ocean, passing through several large lake-expansions - Pelly, Garry, MacDougall and Franklin. Like the Coppermine, the only other large river of this part of Canada, it is rendered unnavigable by a succession of rapids and rocks. It was discovered and explored by Sir George Back in 1834. Its total length is 560 m.
These files are public domain.
Chisholm, Hugh, General Editor. Entry for 'Back's River'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/b/backs-river.html. 1910.