The History of the Steel Helmet軍用ヘルメット The History of the Steel Helmet in the First World War: Vol 1 の詳細情報
The History of the Steel Helmet in the First World War: Vol 1: Austro-Hungary, Belgium, Bulgaria, Czechoslovakia, France, Germany
The History of the Steel Helmet in the First World War: Vol 2: Great Britain, Greece, Holland, Italy, Japan, Poland, Portugal, Romania, Russia, Serbia, Turkey, United States