Szukana fraza: [Abstrakt = "The article analyzes the present role of renewable energy resources in U.S. energy production including Pennsylvania. Comparisons are being made to European Union \(EU\-27\) block, the Organization for Economic Co\-operation and Development \(OECD\) block, and some developing and third world countries. Classification of main energy resources and their trends in the USA energy production is provided. Renewable energy resources are analyzed and their contribution to the USA energy balance is described."]

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