The List of Serials Indexed for Online Users (LSIOU) provides bibliographic information for all journals whose articles were ever indexed over time with the MeSH(R) vocabulary and cited in MEDLINE(R), the backbone of the NLM PubMed(R) database.

A keyword listing of serial titles currently received by the National Library of Medicine.

The List of Serials Indexed for Online Users (LSIOU) provides bibliographic information for all journals ever indexed over time for MEDLINE. It includes titles that ceased publication, changed titles, or were deselected. The 2007 edition contains 12,493 serial titles, including 5,164 titles currently indexed for MEDLINE, cited alphabetically by abbreviated title followed by full title. The List of Serials Indexed for Online Users is available free in both Portable Document Format (PDF) and eXtensible Markup Language (XML) format.

Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.

February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index