MPG.eBooks - Search Results - (((polio or polyio) or pol) or (((polyis OR polyions) or pole) or role))

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If you are trying to use Boolean operators, they must be ALL CAPS: (((polio OR polyio) OR pol) OR (((polyis OR polyions) OR pole) OR role)).
The words AND, OR and NOT may confuse the search; try adding quotes: "(((polio or polyio) or pol) or (((polyis OR polyions) or pole) or role))".
Adding a wildcard symbol may retrieve word variants: (((polio or polyio) or pol) or (((polyis OR polyions) or pole) or role))*.