You need to prepare a text file with your duplicates. 
The format for journals is very simple. 

For journals leave a blank line between each book/journal. The
Journal format is:
Title
Year: Volume (Issue,Issue,Issue-Issue)
e.g.
The
Journal of Unorthodox Medicine
2005: 23 (1,2)
2006: 24 (1-12,14), 25
(1-4)

For books/reports use the format:
Title<tab>Year<tab>ISBN<tab>
1.1

When your duplicates list is ready, log into GRATISNET and click on the Duplicates button.

action
1.2
From the menu tab, click on "Load Duplicates".  Select the duplicates type (Journal/Book), how long the list will be available, and use the BROWSE button to locate your text file, click on ?pload your duplicates list.  You will then be asked to confirm or remove your list - review the list of duplicates shown.

If there are some errors - just click REMOVE THE LIST AND RE-LOAD

If it looks OK - just click APPROVE THE LIST - your duplicates email will go
out to the libraries.

Libraries will receive an email and can select the items that they want to
request.  These will immediately be removed from the available selection
list.
 
3 Where other libraries have declared Missing Issues in their holdings, these libraries will be emailed with an alert if your duplicates match their missing issues

FAQ Category
InterLoans
Summary
You need to prepare a text file with your duplicates. The format for journals is very simple. For journals leave a blank line between each book/journal. The Journal format is: TitleYear: Volume (Issue,Issue,Issue-Issue) e.g.The Journal of Unorthodox Medicine2005: 2 (1,2)2006: 2 (1-12,14), 25 (1-4) For books/reports use the format:Title tab Year tab ISBN tab 1. When your duplicates list is ready, log into ...