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PH helmet
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<h2 id="external-links">External links</h2> Wikimedia Commons has media related to PH helmets. <ul><li><a href="https://web.archive.org/web/20070928043214/http://www.gasmasks.net/database/uk/uk.htm">The gas mask database: The UK</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Apparatus Of Gas Warfare". The Western Front Association. Archived from the original on 27 July 2009. Retrieved 17 October 2011. <a href="https://web.archive.org/web/20090727021040/http://www.westernfrontassociation.com/great-war-on-land/weapons-equipment-uniform/74-apparatus-gas.html" target="_blank">https://web.archive.org/web/20090727021040/http://www.westernfrontassociation.com/great-war-on-land/weapons-equipment-uniform/74-apparatus-gas.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>CWS Barker (1926). "Gas mask development". Chemical Warfare. 12 (7): 11–15. Archived from the original on 2 May 2007. Retrieved 8 May 2006. <a href="https://web.archive.org/web/20070502092709/http://www33.brinkster.com/iiiii/gasmask/development.html" target="_blank">https://web.archive.org/web/20070502092709/http://www33.brinkster.com/iiiii/gasmask/development.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>The Riddle of the Rhine: Chemical Strategy in Peace and War, Victor LeFebure, at Project Gutenberg <a href="http://www.gutenberg.org/dirs/etext98/rrhin10.txt" target="_blank">http://www.gutenberg.org/dirs/etext98/rrhin10.txt</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"History of the U.S. Army's protective mask" (PDF). Archived from the original (PDF) on 20 July 2006. Retrieved 17 October 2011. <a href="https://web.archive.org/web/20060720123700/http://www.eustis.army.mil/dtpmsec/NBC_School/Mask%20History.pdf" target="_blank">https://web.archive.org/web/20060720123700/http://www.eustis.army.mil/dtpmsec/NBC_School/Mask%20History.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>