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Brodie helmet - Wikipedia
Combat helmet from World War I used by the 93rd Infantry Division | National Museum of African American History and Culture
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
5 Real-Life WWI Artifacts As Depicted In Netflix's "All Quiet on the Western Front" | National WWI Museum and Memorial
M-1 Helmet of Leonard T. Schroeder | The National WWII Museum | New Orleans
John Leopold Brodie (1873-1945) - Mark 1 steel helmet
Leatherhead to Radio-head: The Evolution of the Football Helmet | Arts & Culture| Smithsonian Magazine