"Boolean searching is built on a method of symbolic logic developed by George Boole, a 19th century English mathematician.
Boolean searches allow you to combine words and phrases using the words AND, OR, NOT (known as Boolean operators) to limit, broaden, or define your search. A good researcher should know how to do a Boolean Search." -NYPL.org
Source: https://www.nypl.org/blog/2011/02/22/what-boolean-search
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