| http://www.w3.org/ns/prov#value | - The result was a ship that could make the round-trip to New Orleans on the Ohio and Mississippi Rivers, setting a speed record of 10 miles per hour downstream and 3 miles per hour upstream.For the first 30 years of their development, steamboats were an extremely dangerous way to travel: an estimated 500 vessels were lost, causing 4,000 deaths.
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