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<h1 class="articleH1">Letter X <br />(1979-1996)</h1>
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<map name="index_letters" id="index_a_z_MD">
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<area shape="rect" alt="letter a" coords="4,2,25,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/a_96.html" title="letter A" />
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<area shape="rect" alt="letter B" coords="25,2,48,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/b_96.html" title="letter B" />
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<area shape="rect" alt="letter C" coords="48,2,70,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/c_96.html" title="letter C" />
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<area shape="rect" alt="Letter D" coords="71,2,94,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/d_96.html" title="Letter D" />
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<area shape="rect" alt="Letter E" coords="95,2,116,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/e_96.html" title="Letter E" />
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<area shape="rect" alt="Letter F" coords="116,2,137,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/f_96.html" title="Letter F" />
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<area shape="rect" alt="Letter G" coords="138,2,161,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/g_96.html" title="Letter G" />
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<area shape="rect" alt="Letter H" coords="160,2,185,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/h_96.html" title="Letter H" />
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<area shape="rect" alt="Letter I" coords="185,2,201,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/i_96.html" title="Letter I" />
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<area shape="rect" alt="Letter J" coords="201,2,222,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/j_96.html" title="Letter J" />
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<area shape="rect" alt="Letter K" coords="223,2,245,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/k_96.html" title="Letter K" />
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<area shape="rect" alt="Letter L" coords="245,2,266,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/l_96.html" title="Letter L" />
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<area shape="rect" alt="Letter M" coords="267,2,293,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/m_96.html" title="Letter M" />
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<area shape="rect" alt="Letter N" coords="294,2,317,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/n_96.html" title="Letter N" />
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<area shape="rect" alt="Letter O" coords="317,2,341,22" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/o_96.html" title="Letter O" />
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<area shape="rect" alt="Letter P" coords="342,2,363,21" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/p_96.html" title="Letter P" />
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<area shape="rect" alt="Letter Q" coords="364,2,388,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/q_96.html" title="Letter Q" />
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<area shape="rect" alt="Letter R" coords="389,1,411,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/r_96.html" title="Letter R" />
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<area shape="rect" alt="Letter S" coords="411,1,433,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/s_96.html" title="Letter S" />
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<area shape="rect" alt="Letter T" coords="433,1,455,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/t_96.html" title="Letter T" />
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<area shape="rect" alt="Letter U" coords="456,1,479,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/u_96.html" title="Letter U" />
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<area shape="rect" alt="Letter V" coords="480,1,502,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/v_96.html" title="Letter V" />
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<area shape="rect" alt="Letter W" coords="502,1,531,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/w_96.html" title="Letter W" />
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<area shape="rect" alt="Letter X" coords="531,0,553,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/x_96.html" title="Letter X" />
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<area shape="rect" alt="Letter Y" coords="553,0,576,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/y_96.html" title="Letter Y" />
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<area shape="rect" alt="Letter Z" coords="576,1,606,23" href="//www.nlm.nih.gov/pubs/techbull/tbindex1996/z_96.html" title="Letter Z" />
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<dt><font face="helvetica" size="-1"><strong>XS (Indexing Status) Field.</strong></font> <font face="times" size="-1"><a href="//www.nlm.nih.gov/hmd/manuscripts/nlmarchives/techbull.html">1992 Sep-Oct:4; </a><a href="ftp://nlmpubs.nlm.nih.gov/nlminfo/newsletters/techbull/pdf_tb/mayjun93.pdf">1993 May-Jun:25</a></font><br /><br /> </dt>
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<strong>Last updated:</strong> 12 April 2012</p>
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