enhanced with library networking. Libraries may substitute electronic documents for tangible documents as the only copy of the item in the collection, as long as the electronic document is complete, official, and permanently accessible. Access to electronic documents is provided through Persistent Uniform Resources Locators (PURL) and is facilitated by GovInfo and the Catalog of U.S. Government Publications (CGP). Recently, federal agencies have been bypassing the GPO in lieu of publishing documents directly online. These documents, known as "fugitive documents", are not published through GPO, and hence are not part of the FDLP program. See also Legal deposit National Technical Reports Library Ralph J. Bunche Library :Category:Federal depository libraries References External links Federal Depository Library Program website Legal requirements and program regulations U.S. Government Printing Office: Working with Libraries Legislative branch of the United States government United States government information