You need this when
- all copies of the book you are looking for are already on loan from the Oulu University Library,
- you are looking for a book that is located in the Oulu University Library Legal Deposit Archive; it is only available for reading room use in the Pegasus Library but you would need a book for home loan,
- you are looking for a book that is, because of the age of the book or the low use, located in the National Repository Library.
