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Trench Warfarehttp://www.1914-1918.net/intrenches.htmChemical Warfarehttp://www.traces1914.eu/html/reihe-eins/chemical-warfare-in-world-war-i.htmlAerial Warfarehttp://www.century-of-flight.net/Aviation%20history/airplane%20at%20war/World%20War%20I%20Aerial%20Combat.htm