Nihon no Mei Kabuto

Nihon no Mei Kabuto by Yoshihiko Sasama. 1972. 3 volumes, Clothbound with slipcases, 1,039 pages in Japanese. This is the Bull Goose book on Japanese helmets; nothing else in print that I'm aware of comes even close to the depth and detail of this book. Hundreds of photos and a thorough text illustrate everything there is to know on the subject.