Book excerpt: This illustrated two-volume set is a further detailed look at the helmets of all nations using an identifiable helmet during the First World War, and contains over 1,000 full colour, detailed photos and over 200 period bw photos. Featured are rare and unique helmets, some previously unseen. The text includes a short history of the belligerent countries setting the helmets and their development in context as well as details and dimensions of all helmets.