EndNote Online provides a variety of ways to manage and organize your sources. This includes sharing, eliminating duplicate records, and working with pdf attachments.
You can check your library for duplicates at any time.
When using Find Duplicates, EndNote Online compares references based on the following fields:
From a list of references
Within the source record
Illinois State University
Campus Box 8900
201 North School Street
Normal, Il 61790-8900