MPG.eBooks - Search Results - (((("underground workings") OR ("underground openings"))) or ("underground mining"))

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"underground workings" » "underground works"

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If you are trying to use Boolean operators, they must be ALL CAPS: (((("underground workings") OR ("underground openings"))) OR ("underground mining")).
The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"underground workings\") OR (\"underground openings\"))) or (\"underground mining\"))".
Removing quotes may allow a broader search: (((( underground workings ) OR ( underground openings ))) or ( underground mining )).
Adding a wildcard symbol may retrieve word variants: (((("underground workings") OR ("underground openings"))) or ("underground mining"))*.