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

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"renewable energy resources" » "renewable energy ressource", "renewable energy ressources"
"renewable energy resource" » "renewable energy ressource"

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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 resource"))))) 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 resource\"))))) or (\"renewable energy source\"))".
Removing quotes may allow a broader search: (((( renewable energy sources ) or ((( renewable energy resources ) OR ( renewable energy resource ))))) or ( renewable energy source )).
Adding a wildcard symbol may retrieve word variants: (((("renewable energy sources") or ((("renewable energy resources") OR ("renewable energy resource"))))) or ("renewable energy source"))*.