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When you are looking for specific items of interest, use the search tools; enter keywords in the basic search on the landing page or in the header, or the Search page where you can enter keywords and define search parameters.
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Use these options to add or remove words from your search:
AND - the term must be included in any item returned.
OR - the term may be included in any item returned, but does not have to be present. Always relates to the previous keyword/s.*Cannot follow after NOT.
NOT - the term must not be included in any item returned. Always refers only to this keyword. *Cannot be followed by OR
To remove a keyword – click X.
To return to your original search terms – click Clear".