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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Monitoring Instruments". United States Geological Survey. Retrieved 11 February 2016. <a href="https://earthquake.usgs.gov/monitoring/deformation/data/instruments.php" target="_blank">https://earthquake.usgs.gov/monitoring/deformation/data/instruments.php</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>