The cause of World War One! Origins: Rap Battle | WW1 Uncut - BBC - YouTube
WWI U.S. Army Protective Helmet Used by American Rocket Society | National Air and Space Museum
French Adrian Helmet | National Museum of African American History and Culture
Steel Helmet, MK I Brodie pattern: British Army | Imperial War Museums
Travels of a World War I Nurse – Circulating Now from the NLM Historical Collections
The History of the Hard Hat | Innovation| Smithsonian Magazine
WWI Helmets Protect Against Shock Waves Just as Well as Modern Designs | Duke Pratt School of Engineering
Bashford Dean and the Development of Helmets and Body Armor during World War I | Essay | The Metropolitan Museum of Art | Heilbrunn Timeline of Art History
Pickelhaube - Wikipedia
German Helmet - Cork City Council
Belgian steel helmet | NZHistory, New Zealand history online
Prussian Cavalry Officer Helmet > National Museum of the United States Air Force™ > Display
Bashford Dean and Helmet Design During World War I | The Metropolitan Museum of Art
5 Real-Life WWI Artifacts As Depicted In Netflix's "All Quiet on the Western Front" | National WWI Museum and Memorial
Collections (Northwest Museum of Arts + Culture)
Stahlhelm, German helmet - Musée de la Grande Guerre
Were WWI 'Tinpot' Helmets Really Better at Preventing TBI? The Army Says No | Military.com
The Evolution of the Hard Hat - The New York Times
The Evolution of the Hard Hat - The New York Times
Combat helmet from World War I used by the 93rd Infantry Division | National Museum of African American History and Culture
National Museum of the Marine Corps - Artifact Highlight - WWI 2d Division Helmet circa 1918 This M1917 helmet belonged to Marine Arthur E. Lyng. Lyng was a Navy Cross and Distinguished
