Boolean Operators

Use Boolean operators (AND, OR, NOT) to combine keywords in a search.

1.  Use AND to narrow a search. Both search terms must be present in all references retrieved

Example: global warming AND forests



2.  Use OR to expand a search. Your search will retrieve records with EITHER of the terms.  OR is most
     often used to combine synonyms or like terms.
      Example:  children OR adolescents

search string

3.  Use NOT to exclude a term. Records with the first term will be retrieved, but any records with the
     second term will be eliminated.
     Example:  eating disorders NOT bulimia

search string