MPG.eBooks - Search Results - (((("renewable energy sources") or ("renewable energy resources"))) or ((("renewable energy source") OR ("renewable energy resource"))))

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If you are trying to use Boolean operators, they must be ALL CAPS: (((("renewable energy sources") OR ("renewable energy resources"))) OR ((("renewable energy source") OR ("renewable energy resource")))).
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Removing quotes may allow a broader search: (((( renewable energy sources ) or ( renewable energy resources ))) or ((( renewable energy source ) OR ( renewable energy resource )))).
Adding a wildcard symbol may retrieve word variants: (((("renewable energy sources") or ("renewable energy resources"))) or ((("renewable energy source") OR ("renewable energy resource"))))*.