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Sound speed gradient
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/SOFAR_channel/QCcFGWx7">SOFAR channel</a></li> <li><a href="/facts/Wind_gradient/x4dsAfBk">Wind gradient</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Navy Supplement to the DOD Dictionary of Military and Associated Terms (PDF). Department Of The Navy. August 2006. NTRP 1-02. Archived (PDF) from the original on September 22, 2019. <a href="https://apps.dtic.mil/dtic/tr/fulltext/u2/a541070.pdf" target="_blank">https://apps.dtic.mil/dtic/tr/fulltext/u2/a541070.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Lamancusa, J. S. (2000). "10. Outdoor sound propagation". Noise Control (PDF). ME 458: Engineering Noise Control. State College, PA: Penn State University. pp. 10.6 – 10.7. <a href="http://www.mne.psu.edu/lamancusa/me458/10_osp.pdf" target="_blank">http://www.mne.psu.edu/lamancusa/me458/10_osp.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Ahnert, Wolfgang; Steffen, Frank (1999). Sound Reinforcement Engineering. London: Taylor and Francis. p. 40. ISBN 0-415-23870-6. <a href="0-415-23870-6" target="_blank">0-415-23870-6</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Everest, F. (2001). The Master Handbook of Acoustics. New York: McGraw-Hill. pp. 262–263. ISBN 0-07-136097-2. <a href="0-07-136097-2" target="_blank">0-07-136097-2</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Ahnert, Wolfgang; Steffen, Frank (1999). Sound Reinforcement Engineering. London: Taylor and Francis. p. 40. ISBN 0-415-23870-6. <a href="0-415-23870-6" target="_blank">0-415-23870-6</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Navy Supplement to the DOD Dictionary of Military and Associated Terms (PDF). Department Of The Navy. August 2006. NTRP 1-02. Archived (PDF) from the original on September 22, 2019. <a href="https://apps.dtic.mil/dtic/tr/fulltext/u2/a541070.pdf" target="_blank">https://apps.dtic.mil/dtic/tr/fulltext/u2/a541070.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> </ol>