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

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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 resources"))) OR ("renewable energy source")).
The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"renewable energy sources\") OR (\"renewable energy resources\"))) or (\"renewable energy resources\"))) or (\"renewable energy source\"))".
Removing quotes may allow a broader search: (((((( renewable energy sources ) OR ( renewable energy resources ))) or ( renewable energy resources ))) or ( renewable energy source )).
Adding a wildcard symbol may retrieve word variants: (((((("renewable energy sources") OR ("renewable energy resources"))) or ("renewable energy resources"))) or ("renewable energy source"))*.