Q. How can I remove duplicates from my search results?

Removing duplicates from EBSCO databases (e.g., Academic Search Ultimate, APA PsycINFO, Business Search Ultimate) 

As of June 2025, when the new EBSCO interface became available to UMGC, the search results page for EBSCO databases will now show the number of unique results for the initial set of results. The number of unique results may change if the number of results per page is changed, though, since more records are being retrieved and compared against each other. For more information, see Why does the total number of results differ between EBSCO's Classic and New User Interfaces?

Removing duplicates from ProQuest databases (e.g., ABI/INFORM Collection, Dissertations and Theses Global, Healthcare Administration Database, News & Newspapers)

To remove duplicates from any ProQuest database, scroll down on the advanced search page and click on the Result page options link to see additional options for limiting your search results and then check the box next to Exclude duplicate documents.

Removing duplicates across multiple databases

To remove duplicates across multiple databases, you can export all of your search results into a bibliographic management system such as Mendeley, Zotero, Endnote, RefWorks, etc. and then use that system's de-duping feature to remove duplicates from your combined result set.

Important note: Since no de-duping system is perfect, some duplicates may still remain in your result set regardless of which system you use for de-duping. You may need to manually review results in order to ensure that your results contain no duplicates.