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THE INTERNATIONAL BRIGADE DURING THE SPANISH CIVIL WAR, DECEMBER 1936 - JANUARY 1937 (HU 71508) Professor J B S Haldane, and his Canadian assistant Hazen Size demonstrate gas masks in front of a ruined house and huge pile of rubble. Hazen Sise is wearing a gas mask as Haldane describes its functions. Possibly Albacete or Madrid. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205020731