<a href="https://en.wikipedia.org/wiki/Hartley_Colliery_disaster" id="mwrQ" rel="mw:WikiLink" title="Hartley Colliery disaster">Hartley Colliery disaster</a>: Two hundred and four men and boys killed in a mining disaster, prompting a change in UK law which henceforth required all collieries to have at least two independent means of escape.<sup about="#mwt101" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-17"}}' id="cite_ref-17" rel="dc:references" typeof="mw:Extension/ref"><a href="./January_16#cite_note-17" id="mwrg" style="counter-reset: mw-Ref 17;"><span class="mw-reflink-text" id="mwrw">[17]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-17"><cite about="#mwt98" class="citation journal cs1" id="CITEREFCoxe1874">Coxe, Eckley B. (1874). <a class="external text" href="https://books.google.com/books?id=f8nNAAAAMAAJ&amp;pg=RA1-PA19" id="mwCCE" rel="mw:ExtLink nofollow">"Mining Legislation"</a>. <i id="mwCCI">Journal of Social Science</i>: 19<span class="reference-accessdate" id="mwCCM">. Retrieved <span class="nowrap" id="mwCCQ">January 16,</span> 2020</span>.</cite><span about="#mwt98" class="Z3988" id="mwCCU" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Journal+of+Social+Science&amp;rft.atitle=Mining+Legislation&amp;rft.pages=19&amp;rft.date=1874&amp;rft.aulast=Coxe&amp;rft.aufirst=Eckley+B.&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3Df8nNAAAAMAAJ%26pg%3DRA1-PA19&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJanuary+16"></span></span>