Laine Didier, Diffusion Histoire Et
Same guy much the same data, less
expensive and more available then one of the seminal works in the field. Still far short of the first book and all the
text and data are done in French. Of course not so many nice
pictures but a nice evaluation of relative rareness.
This is more important than you think. Really shows
what helmets are hard to come by without listing a price, and therefore putting the book out of date. There is in no other
source that even attempts this. Also relative rarity is not combined with
reserve status so only active relationships. I like
this but the binding is pretty lousy-- actually it is far worse than lousy.