The Knarr reference article from the English Wikipedia on 24-Apr-2004
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Knarr

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The knarr (plural: knarren) was the generic name for viking trade and mercantile ships. Typically they were broader in the beam and had a deeper draught than the vessels used for raiding, the longships. They were also less reliant on oars as a means of propulsion and more on the use of sails.