http://radiophlegm.blogspot.com/2010/03/gas-mask-fashion.html
http://toxipedia.org/display/toxipedia/Chemical+Warfare
http://www.telegraph.co.uk/history/world-war-two/6162832/In-Pictures-gas-mask-gallery.html?image=3
http://graffitiall.blogspot.com/2011/08/gas-mask.html
http://www.loc.gov/rr/scitech/tracer-bullets/mask.html
http://www.war44.com/blitz/62-gas-mask.html
http://emowb.blogspot.com/2011/07/first-world-war-gas-mask.html
http://olive-drab.com/od_soldiers_gear_gasmask_m2.php
http://thegrumpyowl.com/2010/10/17/gas-mask-gallery/
http://www.lonesentry.com/manuals/handbook-japanese-military/japanese-chemical-equipment.html
http://avaxnews.com/appealing/Gas_Masks_3.html
http://news.nationalgeographic.com/news/2009/04/photogalleries/first-earth-day-1970-pictures/
http://www.telegraph.co.uk/history/world-war-two/6169129/World-War-2-Church-goers-carry-gas-masks.html
http://www.flickr.com/photos/davidcory/galleries/72157623458747621
http://artbreath.wordpress.com/2008/09/15/gasmasks/
http://www.guardian.co.uk/books/2010/may/16/listening-to-britain-war-observation#
http://www.documentingreality.com/forum/f181/wwi-gas-mask-images-19700/
