A History of Shaving and Razors is a classic book by Phillip L. Krumholz. It is very rare and hard to find! Included is his other written work on razors - Value Guide for Barberiana & Shaving Collectables. Both are out of print at this point and available electronically. Two for one special! E-book
Please note: these books were written in the 1990's and the valuations for razors are out of date. The history and detailed information is not however- these are essential guides if you are starting a razor collection or have questions about this hobby.
Gillette & Safety Razor Collecting Ebook Wetshaving Supplies Buying Guide