Medline/PubMed Baseline Repository Home page logo.  Four disks that represent databases with the words MEDLINE, Baseline, Repository, and 2002 - Present in the disks to show that we have baseline information starting in 2002.
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Researchers have requested the ability to have available MEDLINE citations in the state they were at a given moment in time without the MeSH vocabulary updates and other revisions that occur during the year. The MEDLINE/PubMed Baseline Repository was set up to provide this capability. We have stored the baseline snapshot created at the beginning of each new MeSH Indexing Year containing the MEDLINE, OLDMEDLINE, and PubMed-not-MEDLINE records for each year starting in 2002 along with a selection of the associated MeSH Vocabulary data files.

The baselines are normally generated towards the middle of November each year and contain all completed citations in MEDLINE as of that date. The baselines represent MEDLINE after the year-end processing has been completed. This means that the records have been revised with the upcoming year's new MeSH vocabulary terms. We currently have available the 2002 - 2014 MEDLINE/PubMed Baselines. The naming of the baselines represents this year-end processing. For example, the 2002 MEDLINE/PubMed Baseline contains all completed citations from the mid-1960's until the date the baseline was created in late November 2001 with the year-end processing assigning appropriate 2002 MeSH vocabulary terms, thus it is a baseline for the 2002 year.

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