You can define what EndNote21 looks for to determine if 2 records are duplicates in the preferences (See Setting EndNote up with Preferences for help with this).
Find duplicate records
- Click on the Library menu.
- Click on Find Duplicates.
- You will be shown the two records side by side and get to choose which record to keep.
Remove records
- After running Find Duplicates, you can choose which record to keep. The other record will be discarded.
- Alternatively, a group called Duplicates will appear in the left of your window until you close the library.
- Drag and drop any record you wish to delete into the trash group.