bn:03328799n
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HI
ऊर्जा अनुसंधान  ऊर्जा उत्पादन  ऊर्जा के बुनियादी ढांचे  ऊर्जा विकास  ऊर्जा स्रोत
EN
Energy development is the field of activities focused on obtaining sources of energy from natural resources. Wikipedia
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