To access the MBR Query Tool, you must be a recognized
licensee of
NLM Data. NLM leases MEDLINE/PubMed to U.S. and non-U.S. individuals or organizations and to its formally recognized
International MEDLARS Centers.
We update the authorization information daily at 1800 Eastern
Standard Time.
We monitor and provide support for this site from 0800 to 1700
(Eastern Standard Time) Monday to Friday, excluding holidays.
If you experience any problems while using the MBR web site, or would
like additional information about leasing MEDLINE/PubMed data, send
an e-mail to
NLMdatadistrib@nlm.nih.gov.
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.