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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/2010_Copiapo_mining_accident/NSNYkoTg">2010 Copiapo mining accident</a></li> <li><a href="/facts/San_Jose_Mine/LEqWGJXg">San Jose Mine</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>James G. Speight (1994). The Chemistry Tech of Coal 2e. Marcel Dekker. p. 105. ISBN 978-0-8247-9200-8. <a href="978-0-8247-9200-8" target="_blank">978-0-8247-9200-8</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>International Correspondence Schools (1900). A treatise on coal mining. The Colliery engineer co. p. 33. <a href="https://archive.org/details/atreatiseoncoal00schogoog" target="_blank">https://archive.org/details/atreatiseoncoal00schogoog</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>