British WWI Officer Service Dress Peaked Cap- Size US 7 1/4 (58cm)
WWI U.S. Army Protective Helmet Used by American Rocket Society | National Air and Space Museum
German Helmet - Cork City Council
Uniforms and Personal Gear - Cap | Canada and the First World War
Ford Motor Company | American Helmet Model No. 8 | American, Philadelphia | The Metropolitan Museum of Art
Cowboys in Khaki': WWI exhibit remembers the service of 'Westerners in the Great War'
The M1 Helmet: The Soldier's helmet | Article | The United States Army
German Prussian M1907 FIELD GREY CAP Kratzchen - All Sizes - WW1 Repro Army Hat | eBay
The Brodie Helmet | National Army Museum, London
WORLD WAR I TREASURES IN THE STOREROOM
R25A-23 WW1 Imperial Russian Army Officers Visor Hat Green Wool Size 7 1/8 | eBay
Adrian helmet - Wikipedia
The Australian Imperial Force (AIF) headwear 1914-1918 | Australian War Memorial
British WW1 Wool Trench Caps - Etsy
World War I 55th U.S. Engineers Painted Helmet | Antiques Roadshow | PBS
John Leopold Brodie (1873-1945) - Mark 1 steel helmet
U.S. officer's campaign hat, World War I] - The Portal to Texas History
Amazon.com: British WWI Officer Service Dress Peaked Cap- Size US 7 (56cm): Clothing, Shoes & Jewelry
World War One Doughboy Helmet] - UNT Digital Library
Hard Hat Turns 101; Impact on Industrial Safety Never Gets Old - World War I Centennial
Eleven Artifacts of Heroism from America's Wars | At the Smithsonian| Smithsonian Magazine
The Australian Imperial Force (AIF) headwear 1914-1918 | Australian War Memorial
WWI U.S. Army Officer's Visor Hat or Cap | eBay
The Evolution of the Hard Hat - The New York Times
