Stacks is the primary system for access to rights restricted digital materials in the permanent collections of the Library of Congress. In contrast, (a) public domain and other unrestricted digitized content is broadly available via the Library’s public website; and (b) subscription databases and other licensed content is primarily available via the Electronic Resources Online Catalog (EROC).
Materials in Stacks are described and managed through other metadata systems, primarily the Library of Congress Online Catalog.