3420
This work was accomplished , in his own words , " with considerably difficulty and peril , journeys to and from the works being made either in small rowboats or Indian canoes through water that were of a very treacherous character and often with only Indians for crew " .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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