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<title>UMLS - Release Documentation Archive</title>
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<meta name="DC.Description.Abstract" content="Includes the current release documentation for the Unified Medical Language System, as well as archived documentation for prior releases." />
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<div class="h1">UMLS - Release Documentation Archive</div>
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<div class="grid-row grid-gap-1"><!-- start row-->
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<p><strong><a href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">Current Release Documentation</a></strong><br />
Note: As of the 2009AA UMLS Release, general reference information is available as the <a href="http://www.ncbi.nlm.nih.gov/books/NBK9676/"><em>UMLS Reference Manual</em></a>. Information specific to a UMLS Release, such as sources included in the current version of the Metathesaurus and statistics regarding the number of concepts, remains on the UMLS Web site as part of the <a href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">Release Documentation</a>.</p>
<p><strong><a href="https://uts.nlm.nih.gov/uts/assets/LicenseAgreement.pdf">Current UMLS License Agreement </a></strong></p>
<p><a href="https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/bugs_previous.html">Previous Release Bugs</a></p>
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<h2>Previous UMLS Releases</h2>
<table class="usa-table">
<thead>
<tr>
<th>Release</th>
<th>Release Documentation Archives </th>
<th>License Agreement Archival Copy </th>
<th>Source Vocabulary Documentation Archival Copy*</th>
</tr>
</thead>
<tr>
<td>2024AA</td>
<td><a href="https://web.archive.org/web/20240927160715/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2024AA HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2024AA.pdf">2024AA PDF</a></td>
<td><a href="https://web.archive.org/web/20240610183252/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2024AA Source Pages</a>
</td>
</tr>
<tr>
<td>2023AB</td>
<td><a href="https://web.archive.org/web/20240307085518/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2023AB HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2023AB.pdf">2023AB PDF</a></td>
<td><a href="https://web.archive.org/web/20231218183119/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2023AB Source Pages</a>
</td>
</tr>
<tr>
<td>2023AA</td>
<td><a href="https://web.archive.org/web/20230813003644/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2023AA HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2023AA.pdf">2023AA PDF</a></td>
<td><a href="https://web.archive.org/web/20230813003634/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2023AA Source Pages</a>
</td>
</tr>
<tr>
<td>2022AB</td>
<td><a href="https://web.archive.org/web/20230110065920/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2022AB HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2022AB.pdf">2022AB PDF</a></td>
<td><a href="https://web.archive.org/web/20230110064427/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2022AB Source Pages</a>
</td>
</tr>
<tr>
<td>2022AA</td>
<td><a href="https://web.archive.org/web/20220709012230/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2022AA HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2022AA.pdf">2022AA PDF</a></td>
<td><a href="https://web.archive.org/web/20220709011607/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2022AA Source Pages</a>
</td>
</tr>
<tr>
<td>2021AB</td>
<td><a href="https://wayback.archive-it.org/all/20220108220821if_/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2021AB HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2021AB.pdf">2021AB PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20220108220227/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2021AB Source Pages</a></td>
</tr>
<tr>
<td>2021AA</td>
<td><a href="https://wayback.archive-it.org/4253/20211001044435/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2021AA HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2021AA.pdf">2021AA PDF</a></td>
<td><a href="https://wayback.archive-it.org/4253/20211001044435/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2021AA Source Pages</a></td></tr>
<tr>
<td>2020AB</td>
<td><a href="https://wayback.archive-it.org/4253/20210401204620/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2020AB HTML</a></td>
<td><a href="https://www.nlm.nih.gov/research/umls/archive/pdfs/2020AB.pdf">2020AB PDF</a></td>
<td><a href="https://wayback.archive-it.org/4253/20210401212541/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2020AB Source Pages</a></td></tr>
<tr>
<td>2020AA</td>
<td><a href="https://wayback.archive-it.org/4253/20201001040104/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2020AA HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2020AA.pdf">2020AA PDF</a></td>
<td><a href="https://wayback.archive-it.org/4253/20201001040135/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2020AA Source Pages</a></td></tr>
<tr>
<td>2019AB</td>
<td><a href="https://wayback.archive-it.org/4253/20200407131304/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2019AB HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2019AB.pdf">2019AB PDF</a></td>
<td><a href="https://wayback.archive-it.org/4253/20200401051241/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2019AB Source Pages</a></td>
</tr>
<tr>
<td>2019AA</td>
<td><a href="https://wayback.archive-it.org/4253/20191001040023/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2019AA HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2019AA.pdf">2019AA PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20190708194445/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2019AA Source Pages</a></td>
</tr>
<tr><td>2018AB</td><td><a href="https://wayback.archive-it.org/4253/20190401040025/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2018AB HTML</a></td><td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2018AB.pdf">2018AB PDF</a></td><td><a href="https://wayback.archive-it.org/4253/20190401040027/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2018AB Source Pages</a></td></tr>
<tr><td>2018AA</td><td><a href="http://wayback.archive-it.org/4253/20181011144416/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2018AA HTML</a></td><td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2018AA.pdf">2018AA PDF</a></td><td><a href="http://wayback.archive-it.org/4253/20181011144418/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2018AA Source Pages</a></td></tr>
<tr>
<td>2017AB</td>
<td><a href="http://wayback.archive-it.org/4253/20180417125258/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2017AB HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2017AB.pdf">2017AB PDF</a></td>
<td><a href="http://wayback.archive-it.org/4253/20180417125300/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2017AB Source Pages</a>
<tr>
<td>2017AA</td>
<td><a href="http://wayback.archive-it.org/4253/20171017125258/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2017AA HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2017AA.pdf">2017AA PDF</a></td>
<td><a href="http://wayback.archive-it.org/4253/20171017125300/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2017AA Source Pages</a></td>
</tr>
<tr>
<td>2016AB</td>
<td><a href="https://wayback.archive-it.org/4253/20170417125306/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2016AB HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2016AB.pdf">2016AB PDF</a></td>
<td>&nbsp;</td>
</tr>
<tr>
<td>2016AA</td>
<td><a href="http://wayback.archive-it.org/4253/20161017125428/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2016AA HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2016AA.pdf">2016AA PDF</a></td>
<td>&nbsp;</td>
</tr>
<tr>
<td>2015AB</td>
<td><a href="http://wayback.archive-it.org/4253/20160415125816/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2015AB HTML</a></td>
<td><a href="http://www.nlm.nih.gov/research/umls/archive/pdfs/2015AB.pdf">2015AB PDF</a></td>
<td><a href="http://wayback.archive-it.org/4253/20160415130228/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2015AB Source Pages</a></td>
</tr>
<tr>
<td>2015AA</td>
<td><a href="http://wayback.archive-it.org/4253/20151006172949/https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2015AA HTML</a></td>
<td><a href=" http://www.nlm.nih.gov/research/umls/archive/pdfs/2015AA.pdf">2015AA PDF</a></td>
<td><a href="http://wayback.archive-it.org/4253/20151006173006/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2015AA Source Pages</a></td>
</tr>
<tr>
<td>2014AB</td>
<td><a href="http://wayback.archive-it.org/4253/20150414141833/http://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html#">2014AB HTML</a></td>
<td><a href=" http://www.nlm.nih.gov/research/umls/archive/pdfs/2014AB.pdf">2014AB PDF</a></td>
<td><a href="http://wayback.archive-it.org/4253/20150414141851/http://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2014AB Source Pages</a></td>
</tr>
<tr>
<td>2014AA</td>
<td><a href="https://wayback.archive-it.org/4253/20141024172213/http://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/index.html">2014AA HTML</a></td>
<td><a href=" http://www.nlm.nih.gov/research/umls/archive/pdfs/2014AA.pdf">2014AA PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20141030164040/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2014AA Source Pages</a></td>
</tr>
<tr>
<td>2013AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20140415/research/umls/knowledge_sources/metathesaurus/release/index.html">2013AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2013AB.pdf">2013AB PDF</a></td>
<td>&nbsp;</td>
</tr>
<tr>
<td>2013AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20131028/research/umls/knowledge_sources/metathesaurus/release/index.html">2013AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2013AA.pdf">2013AA PDF</a></td>
<td>&nbsp;</td>
</tr>
<tr>
<td>2012AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20130415/research/umls/knowledge_sources/metathesaurus/release/index.html">2012AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2012AB.pdf">2012AB PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20130703175739/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html#">2012AB Source Pages</a></td>
</tr>
<tr>
<td>2012AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20121017/research/umls/knowledge_sources/metathesaurus/release/index.html">2012AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2012AA.pdf">2012AA PDF</a></td>
<td><a href="https://web.archive.org/web/20130127103710/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2012AA Source Pages</td>
</tr>
<tr>
<td>2011AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20120416/research/umls/knowledge_sources/metathesaurus/release/index.html">2011AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2011AB.pdf">2011AB PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20120427103938/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2011AB Source Pages</td>
</tr>
<tr>
<td>2011AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20111017/research/umls/knowledge_sources/metathesaurus/release/index.html">2011AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2011AA.pdf">2011AA PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20110727104850/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2011AA Source Pages</a></td>
</tr>
<tr>
<td>2010AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20110413/research/umls/knowledge_sources/metathesaurus/release/index.html">2010AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2010AB.pdf">2010AB PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20110327162548/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2010AB Source Pages</a></td>
<!-- "https://web.archive.org/web/20101221055726/http://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/updated_sources.html"-->
</tr>
<tr>
<td>2010AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20101022/research/umls/knowledge_sources/metathesaurus/release/index.html">2010AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2010AA.pdf">2010AA PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20201010123542/http://www.nlm.nih.gov/research/umls/sourcereleasedocs/index_2010aa.html">2010AA Source Pages</a></td>
</tr>
<tr>
<td>2009AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20100422/research/umls/knowledge_sources/metathesaurus/release/index.html">2009AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2009AB.pdf">2009AB PDF</a></td>
<td><a href="https://web.archive.org/web/20100307141257/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2009AB Source Pages</a></td>
</tr>
<tr>
<td>2009AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20091028/research/umls/knowledge_sources/metathesaurus/release/index.html">2009AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2009AA.pdf">2009AA PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20090924091833/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2009AA Source Pages</a></td>
</tr>
<tr>
<td>2008AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20090403/research/umls/umlsdoc.html">2008AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2008AB.pdf">2008AB PDF</a></td>
<td><a href="https://wayback.archive-it.org/all/20090323215543/https://www.nlm.nih.gov/research/umls/sourcereleasedocs/index.html">2008AB Source Pages</a></td>
</tr>
<tr>
<td>2008AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20081104/research/umls/umlsdoc.html">2008AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2008AA.pdf">2008AA PDF</a></td>
</tr>
<tr>
<td>2007AC</td>
<td><a href="http://www.nlm.nih.gov/archive/20080312/research/umls/umlsdoc.html.notice.html">2007AC HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2007AC.pdf">2007AC PDF</a></td>
</tr>
<tr>
<td>2007AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2007AB/umlsdoc.html.notice.html">2007AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2007AB.pdf">2007AB PDF</a></td>
</tr>
<tr>
<td>2007AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2007AA/umlsdoc.html.notice.html">2007AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2007AA.pdf">2007AA PDF</a></td>
</tr>
<tr>
<td>2006AD</td>
<td><a href="http://www.nlm.nih.gov/archive/20080326/research/umls/archive/2006AD/umlsdoc.html.notice.html">2006AD HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2006AD.pdf">2006AD PDF</a></td>
</tr>
<tr>
<td>2006AC</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2006AC/umlsdoc.html.notice.html">2006AC HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2006AC.pdf">2006AC PDF</a></td>
</tr>
<tr>
<td>2006AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2006AB/umlsdoc.html.notice.html">2006AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2006AB.pdf">2006AB PDF</a></td>
</tr>
<tr>
<td>2006AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2006AA/umlsdoc.html.notice.html">2006AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2006AA.pdf">2006AA PDF</a></td>
</tr>
<tr>
<td>2005AC</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2005AC/umlsdoc.html.notice.html">2005AC HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2005AC.pdf">2005AC PDF</a></td>
</tr>
<tr>
<td>2005AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2005AB/umlsdoc.html.notice.html">2005AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2005AB.pdf">2005AB PDF</a></td>
</tr>
<tr>
<td>2005AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2005AA/umlsdoc.html.notice.html">2005AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2005AA.pdf">2005AA PDF</a></td>
</tr>
<tr>
<td>2004AC</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2004AC/umlsdoc.html.notice.html">2004AC HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2004AC.pdf">2004AC PDF</a></td>
</tr>
<tr>
<td>2004AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2004AB/umlsdoc.html.notice.html">2004AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2004AB.pdf">2004AB PDF</a></td>
</tr>
<tr>
<td>2004AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20080407/research/umls/archive/2004AA/UMLSDOC.html.notice.html">2004AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2004AA.pdf">2004AA PDF</a></td>
</tr>
<tr>
<td>2003AC</td>
<td><a href="http://www.nlm.nih.gov/archive/20050329/research/umls/archive/2003AC/UMLSDOC.html.notice.html">2003AC HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2003AC.pdf">2003AC PDF</a></td>
</tr>
<tr>
<td>2003AB</td>
<td><a href="http://www.nlm.nih.gov/archive/20050329/research/umls/archive/2003AB/UMLSDOC.html.notice.html">2003AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2003AB.pdf">2003AB PDF</a></td>
</tr>
<tr>
<td>2003AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20050328/research/umls/archive/2003AA/UMLSDOC.html.notice.html">2003AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2003AA.pdf">2003AA PDF</a></td>
</tr>
<tr>
<td>2002AD </td>
<td><a href="/research/umls/archive/2002AD/2002AD_addendum.pdf">2002AD HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2002AD.pdf">2002AD PDF</a></td>
</tr>
<tr>
<td>2002AC </td>
<td><a href="/research/umls/archive/2002AC/2002AC_Addendum.pdf">2002AC HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2002AC.pdf">2002AC PDF</a></td>
</tr>
<tr>
<td>2002AB </td>
<td><a href="/research/umls/archive/2002AB/2002AB_addendum.pdf">2002AB HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2002AB.pdf">2002AB PDF</a></td>
</tr>
<tr>
<td>2002AA</td>
<td><a href="http://www.nlm.nih.gov/archive/20050111/research/umls/archive/2002AA/umlsdoc.html.notice.html">2002AA HTML</a></td>
<td><a href="/research/umls/archive/pdfs/2002AA.pdf">2002AA PDF</a></td>
</tr>
</table>
<p>*Archived from 2008AB-present.</p>
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<p class=”margin-top-5”><small>Last Reviewed: October 30, 2024</small></p>
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