The International Standard Serial Number (ISSN) is
|“||[a] unique identifier assigned to a serial publication by national centers under the auspices of the ISSN network. The U.S. Copyright Office does not assign these numbers to published works. In the United States, ISSNs are administered by the Library of Congress.||”|
- ↑ Compendium of U.S. Copyright Office Practices, Third Edition, Glossary, at 10.