Word: byproduct
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Dates: during 1960-1969
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...distinctive old steamboat whistles gave way to the diesel-powered towboats' raucous horns, and each year the towboats nursed some 80 million tons of cargo up through the 46 locks. But as a thing of beauty, the Ohio ran downhill; the sprawling, river-fed cities fed back a byproduct of civilization-raw sewage and industrial wastes -until the great stream became an open sewer. Game fish bellied up and died; riverfront Manhattan Beach, near Bellevue, Ky., was covered with a foul slime; Louisville's water system doused river water so heavily with chemicals that the citizens howled...