Phil Krumholz has been a major contributor to the knowledge base of barberiana in the US and indeed globally.
Phil has written four books on shaving history & collectibles over the years and I own & have enjoyed each & every one of them. No longer in print these worthy tomes may been obtained from Phil. He goes by Razorman2 on eBay & may been contacted that way.
I've bought tons of vintage RBW's from Phil over the years and he is not only a major contributor to our hobby but is a stand-up good guy as well.
BTW - ask him to autograph any books you buy from him :)