All requests for updates to existing metadata should be forwarded to the Head of Digital Services, who will instruct the archivist in what form to provide the information (usually a spreadsheet or alternative electronic format). Over time, cataloged and uncataloged material has been ingested into the Digital Library with varying levels of description and varied call numbers. To ensure a comprehensive call number update, it is important to conduct thorough call number, title, and keyword searches to identify digitized items from a particular collection. If alternate call numbers have been used to identify components – for items stored in ARTSTOR, for example – search the DL for these strings as well.