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HOLLIS User Guide

Search tips for getting started, recommendations for those coming from Classic, and general system documentation for how HOLLIS works.

Search Operators

Note: the following search operators can be used in HOLLIS, HOLLIS Images, and Databases.


Exact Phrase

Use quotation marks to search for your terms as an exact phrase. Great for title searches.

"capital in the twenty-first century"

Boolean Connectors

AND, OR, and NOT must be in all caps to be recognized as operators.

NSA OR "National Security Agency"

cellular NOT phone

Order of Operations

Use parentheses to define the order of operations.

("Affordable Care Act" OR Obamacare) AND "birth control"


? matches a single character and * matches multiple characters.


gene* therapy