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Enlace: http://www.nlc-bnc.ca/passages/

Descripción: National Library of Canada.
«The truth is that America, and North America in particular, was discovered - if we can use that word - one step at a time, by a number of people too great to count. In terms of geographical discoveries, it took more than four centuries of exploration, from the time of the arrival of the first Europeans, to discover and traverse a navigable passage across North America linking the Atlantic and Pacific oceans - the famous Northwest Passage.»