It is the online catalog NLM provides its on-site patrons, and it also serves as the retrieval engine for the library's cataloging records, replacing existing online access methods, such as Locator, CATLINE, AVLINE, and SERLINE
In 1973, NLM developed the SERLINE
database, which originally included information on serials owned by NLM but later was expanded to include holdings information for the regional medical libraries and resource libraries (Bunting, 1987, p.
All MEDLINE subscriptions from SilverPlatter include the entire SERLINE
database, free on CD.