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| | Lesson Tutor: Go Eat Your Homework! Pittsburgh |
 | | Known throughout America as the city with the world's largest blast furnaces, Pittsburgh was nicknamed "The Hearth of the Nation." Tongues of flame rose from the city at night that were visible for miles along the Allegheny, Ohio, and Monongahela rivers. |
 | | Today, Pittsburgh places importance on smoke-pollution control, flood prevention, ecologically clean rivers, and sewage control as it embraces the manufacturing of products such as petroleum, electrical equipment, machinery, coke, and chemical products, as well as the coal and steel for which it has long been famous. |
 | | Indeed, Pittsburgh is ranked today as one of the nation's largest and most active inland river ports. |
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