File:Anti-gas curtain arrangements on dugout steps.png
English: Diagram of anti-gas arrangements on the steps of a dug-out
|Source||(1923). Medical Services: Diseases of the War: Including the Medical Aspects of Aviation and Gas Warfare and Gas Poisoning in Tanks and Mines. History of the Great War Based on Official Documents by Direction of the Historical Section of the Committee of Imperial Defence II. London: HMSO. OCLC 769752656. Retrieved 13 September 2013.|
|Author||MacPherson, W. G.; Herringham, W. P.; Elliott, T. R.; Balfour, A.|
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