I'm currently reading the Col. Brophy book, I first bought the Joe Poyer book ($20) and later found a copy of Mr. Mallory's book from another collector.  I've been told there is a 4th book by Mr. Farmer (member of this forum) also that is available.  As I haven't completely read all of the books, I can relay what I was told when I was searching for the books (asked the same question your posting) - Mr. Mallory's has more details from the SRS but that Col. Brophy's has clearer pictures.